Mars has not always been a seemingly lifeless red desert. We have evidence that billions of years ago it had a warm, habitable climate with liquid water in lakes and flowing rivers , which is somewhat confusing, given that Mars is much farther from the Sun than the Earth and that the Sun was much less bright back then. “In order for Mars to be warm enough to host liquid water, there must have been a lot of carbon dioxide in the atmosphere,” says Benjamin Tutolo, a researcher at the University of Calgary. “The question we’ve been asking for at least 30 years was where the record of all this carbon is.”

Tutolo led a new study of rock samples collected by the Curiosity rover that might have answered this question.

The tallest sediment stack

The mystery of Mars’ missing carbon stems from two seemingly conflicting results. On the one hand, we have already found dried riverbeds and lakes on the surface of Mars, so we know there must have been liquid water on its surface at some point. To account for the presence of this water, every Martian climate model we have run indicates that huge amounts of atmospheric carbon were needed to provide a sufficient greenhouse effect to keep the surface temperature above freezing. But the data we were getting from satellite observations of Mars found much less carbon in the Martian soil than those climate models would suggest. “So, either the models were incorrect—and there’s no good reason to believe that—or there really was lots of carbon in the Martian atmosphere,” Tutolo says.

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Mars has not always been a seemingly lifeless red desert. We have evidence that billions of years ago it had a warm, habitable climate with liquid water in lakes and flowing rivers , which is somewhat confusing, given that Mars is much farther from the Sun than the Earth and that the Sun was much less bright back then. “In order for Mars to be warm enough to host liquid water, there must have been a lot of carbon dioxide in the atmosphere,” says Benjamin Tutolo, a researcher at the University of Calgary. “The question we’ve been asking for at least 30 years was where the record of all this carbon is.”

Tutolo led a new study of rock samples collected by the Curiosity rover that might have answered this question.

The tallest sediment stack

The mystery of Mars’ missing carbon stems from two seemingly conflicting results. On the one hand, we have already found dried riverbeds and lakes on the surface of Mars, so we know there must have been liquid water on its surface at some point. To account for the presence of this water, every Martian climate model we have run indicates that huge amounts of atmospheric carbon were needed to provide a sufficient greenhouse effect to keep the surface temperature above freezing. But the data we were getting from satellite observations of Mars found much less carbon in the Martian soil than those climate models would suggest. “So, either the models were incorrect—and there’s no good reason to believe that—or there really was lots of carbon in the Martian atmosphere,” Tutolo says.

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Mars has not always been a seemingly lifeless red desert. We have evidence that billions of years ago it had a warm, habitable climate with liquid water in lakes and flowing rivers , which is somewhat confusing, given that Mars is much farther from the Sun than the Earth and that the Sun was much less bright back then. “In order for Mars to be warm enough to host liquid water, there must have been a lot of carbon dioxide in the atmosphere,” says Benjamin Tutolo, a researcher at the University of Calgary. “The question we’ve been asking for at least 30 years was where the record of all this carbon is.”

Tutolo led a new study of rock samples collected by the Curiosity rover that might have answered this question.

The tallest sediment stack

The mystery of Mars’ missing carbon stems from two seemingly conflicting results. On the one hand, we have already found dried riverbeds and lakes on the surface of Mars, so we know there must have been liquid water on its surface at some point. To account for the presence of this water, every Martian climate model we have run indicates that huge amounts of atmospheric carbon were needed to provide a sufficient greenhouse effect to keep the surface temperature above freezing. But the data we were getting from satellite observations of Mars found much less carbon in the Martian soil than those climate models would suggest. “So, either the models were incorrect—and there’s no good reason to believe that—or there really was lots of carbon in the Martian atmosphere,” Tutolo says.

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There are so many factors that can influence how we perceive others, which in turn can determine the people we choose as platonic friends or romantic mates. We certainly make snap judgments based on physical appearance, but scent can have a powerful influence, too. According to a new paper published in the journal Scientific Reports, two heterosexual women meeting for the first time rely partly on scent to judge whether they want to be friends with each other, deciding within minutes—practically at first whiff—whether there is friendship potential.

Social olfactory research largely stems from evolutionary psychology, specifically the work of Swiss biologist Claus Wedekind in 1995. Subtle chemical signals from pheromones are known to play a role in attraction in many species. Scientists had already found evidence in fish and mice that the major histocompatibility complex (MHC) genes, which are critical for immune system function (and useful in determining tissue compatibility for transplants, for instance)—showed a marked preference for sexual partners with different MHC genes, perhaps as a way of keeping the gene pool well-mixed and protecting against inbreeding.

Wedekind introduced the so-called "sweaty T-shirt" method to study the possible role of MHC in mate preferences in humans. Male participants wore the same T-shirt for two days, which were then placed in identical boxes. Women participants then smelled each shirt and indicated which ones they found most sexually attractive. Wedekind found that the women overwhelmingly preferred the T-shirt smells of men who had the most dissimilar MHCs to their own. The only caveat: The preference was reversed in women who were taking oral birth control.

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There are so many factors that can influence how we perceive others, which in turn can determine the people we choose as platonic friends or romantic mates. We certainly make snap judgments based on physical appearance, but scent can have a powerful influence, too. According to a new paper published in the journal Scientific Reports, two heterosexual women meeting for the first time rely partly on scent to judge whether they want to be friends with each other, deciding within minutes—practically at first whiff—whether there is friendship potential.

Social olfactory research largely stems from evolutionary psychology, specifically the work of Swiss biologist Claus Wedekind in 1995. Subtle chemical signals from pheromones are known to play a role in attraction in many species. Scientists had already found evidence in fish and mice that the major histocompatibility complex (MHC) genes, which are critical for immune system function (and useful in determining tissue compatibility for transplants, for instance)—showed a marked preference for sexual partners with different MHC genes, perhaps as a way of keeping the gene pool well-mixed and protecting against inbreeding.

Wedekind introduced the so-called "sweaty T-shirt" method to study the possible role of MHC in mate preferences in humans. Male participants wore the same T-shirt for two days, which were then placed in identical boxes. Women participants then smelled each shirt and indicated which ones they found most sexually attractive. Wedekind found that the women overwhelmingly preferred the T-shirt smells of men who had the most dissimilar MHCs to their own. The only caveat: The preference was reversed in women who were taking oral birth control.

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There are so many factors that can influence how we perceive others, which in turn can determine the people we choose as platonic friends or romantic mates. We certainly make snap judgments based on physical appearance, but scent can have a powerful influence, too. According to a new paper published in the journal Scientific Reports, two heterosexual women meeting for the first time rely partly on scent to judge whether they want to be friends with each other, deciding within minutes—practically at first whiff—whether there is friendship potential.

Social olfactory research largely stems from evolutionary psychology, specifically the work of Swiss biologist Claus Wedekind in 1995. Subtle chemical signals from pheromones are known to play a role in attraction in many species. Scientists had already found evidence in fish and mice that the major histocompatibility complex (MHC) genes, which are critical for immune system function (and useful in determining tissue compatibility for transplants, for instance)—showed a marked preference for sexual partners with different MHC genes, perhaps as a way of keeping the gene pool well-mixed and protecting against inbreeding.

Wedekind introduced the so-called "sweaty T-shirt" method to study the possible role of MHC in mate preferences in humans. Male participants wore the same T-shirt for two days, which were then placed in identical boxes. Women participants then smelled each shirt and indicated which ones they found most sexually attractive. Wedekind found that the women overwhelmingly preferred the T-shirt smells of men who had the most dissimilar MHCs to their own. The only caveat: The preference was reversed in women who were taking oral birth control.

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Popular online shopping meccas Temu and Shein have finally broken their silence, warning of potential price hikes starting next week due to Donald Trump's tariffs.

Temu is a China-based e-commerce platform that has grown as popular as Amazon for global shoppers making cross-border purchases, according to 2024 Statista data . Its tagline, "Shop like a billionaire," is inextricably linked to the affordability of items on its platform. And although Shein—which vows to make global fashion "accessible to all" by selling inexpensive stylish clothing—moved its headquarters from China to Singapore in 2022, most of its products are still controversially manufactured in China, the BBC reported .

For weeks, the US-China trade war has seen both sides spiking tariffs. In the US, the White House last night crunched the numbers and confirmed that China now faces tariffs of up to 245 percent, The Wall Street Journal reported . That figure includes new tariffs Trump has imposed, taxing all Chinese goods by 145 percent, as well as prior 100 percent tariffs lobbed by the Biden administration that are still in effect on EVs and Chinese syringes.

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Popular online shopping meccas Temu and Shein have finally broken their silence, warning of potential price hikes starting next week due to Donald Trump's tariffs.

Temu is a China-based e-commerce platform that has grown as popular as Amazon for global shoppers making cross-border purchases, according to 2024 Statista data . Its tagline, "Shop like a billionaire," is inextricably linked to the affordability of items on its platform. And although Shein—which vows to make global fashion "accessible to all" by selling inexpensive stylish clothing—moved its headquarters from China to Singapore in 2022, most of its products are still controversially manufactured in China, the BBC reported .

For weeks, the US-China trade war has seen both sides spiking tariffs. In the US, the White House last night crunched the numbers and confirmed that China now faces tariffs of up to 245 percent, The Wall Street Journal reported . That figure includes new tariffs Trump has imposed, taxing all Chinese goods by 145 percent, as well as prior 100 percent tariffs lobbed by the Biden administration that are still in effect on EVs and Chinese syringes.

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Popular online shopping meccas Temu and Shein have finally broken their silence, warning of potential price hikes starting next week due to Donald Trump's tariffs.

Temu is a China-based e-commerce platform that has grown as popular as Amazon for global shoppers making cross-border purchases, according to 2024 Statista data . Its tagline, "Shop like a billionaire," is inextricably linked to the affordability of items on its platform. And although Shein—which vows to make global fashion "accessible to all" by selling inexpensive stylish clothing—moved its headquarters from China to Singapore in 2022, most of its products are still controversially manufactured in China, the BBC reported .

For weeks, the US-China trade war has seen both sides spiking tariffs. In the US, the White House last night crunched the numbers and confirmed that China now faces tariffs of up to 245 percent, The Wall Street Journal reported . That figure includes new tariffs Trump has imposed, taxing all Chinese goods by 145 percent, as well as prior 100 percent tariffs lobbed by the Biden administration that are still in effect on EVs and Chinese syringes.

Read full article

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