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NASA’s Mars rover Perseverance is in the home stretch of its journey to Red Planet

The long deep-space journey of NASA’s next Mars rover is nearly over.

The car-size Perseverance rover, which launched on July 30 of last year, is scheduled to land inside the 28-mile-wide (45 kilometers) Jezero Crater on Feb. 18.

“I am thrilled to be here today as our countdown to Mars winds down from months to just weeks,” Lori Glaze, director of NASA’s Planetary Science Division, said during a news conference on Wednesday (Jan. 27). “Perseverance is closing in on the Red Planet, and our team is preparing for her to touch down in Jezero Crater.”

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What if temperature determined a baby’s sex?

Would one sex be favored over another?

The sex of humans is largely controlled by the X and Y sex chromosomes. However, in many reptiles and fish, sex is instead influenced by how warm or cool eggs are before hatching. What might life be like for humans if sex was likewise under the sway of temperature?

The fact it was even possible to control the sex of animals using heat or cold was first uncovered in the rainbow agama lizard in 1966 by French zoologist Madeline Charnier at the University of Dakar in Senegal. She found hatchlings from eggs incubated at lower temperatures were female, while those that developed at higher temperatures were male.

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635 million-year-old fossil is the oldest known land fungus

Its tiny tendrils are 1/10 the width of a human hair.

The oldest evidence of land fungus may be a wee microfossil that’s 635 million years old, found in a cave in southern China.

Too small to be seen with the naked eye, this remarkable find pushes back the appearance of terrestrial fungus by about 240 million years to a period known as “snowball Earth” when the planet was locked in ice from 750 million to 580 million years ago.

The presence of land fungus at this critical point may have helped Earth to transition from a frozen ice ball to a planet with a variety of ecosystems that could host diverse life-forms, scientists wrote in a new study. By breaking down minerals and organic matter and recycling nutrients into the atmosphere and ocean, ancient fungus could have played an important part in reshaping Earth’s geochemistry, creating more hospitable conditions that paved the way for terrestrial plants and animals to eventually emerge and thrive.

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Can people be allergic to exercise?

Some people break out in hives.

Imagine a woman has a few drinks one night, pops some ibuprofen in the morning for her hangover, and goes for a run. She’s never had an issue with alcohol, ibuprofen or exercise before. But this time, some combination of the three triggers a life-threatening allergic reaction known as anaphylaxis.

This is a real case that happened to a patient of Dr. Andrew Murphy, an allergist at Suburban Allergy Consultants in Pennsylvania. So, is it possible to be allergic to exercise?

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