Four reasons not to run a marathon

If your New Year's resolution was to get in shape, signing up for the marathon is a bad way to go about it.

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  • Marathons gained popularity over the last decade. In 2018, 456,700 Americans completed a marathon, an 11 percent increase in participation from 2008.
  • Training for and racing 26.2 miles has been shown to have adverse effects on the heart, such as plaque buildup in the arteries and inflammation.
  • Running too much can lead to chronically increased cortisol levels, resulting in weight gain, fatigue, and lower immune function.
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Tom Björklund
  • Researchers recently uncovered a piece of chewed-on birch pitch in an archaeological dig in Denmark.
  • Conducting a genetic analysis of the material left in the birch pitch offered a plethora of insights into the individual who last chewed it.
  • The gum-chewer has been dubbed Lola. She lived 5,700 years ago; and she had dark skin, dark hair, and blue eyes.
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7 DIY test kits that can reveal hidden info about you, your pet, and your home

Learn where your ancestors are from, the breed of your rescue dog, and if your home is safe with these easy at-home kits.

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  • There is a lot we can learn from the saliva in our mouths and the air in our homes.
  • There are at-home DIY tests for just about everything, but not all of them are as accurate as they claim.
  • From revealing the breed of your dog to testing your home for harmful gases, these kits are worth the money.
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'One among millions': DNA is not the only genetic molecule

A recent computer analysis found that millions of possible chemical compounds could be used to store genetic information. This begs the question — why DNA?

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  • The central dogma of biology states that genetic information flows from DNA to RNA to proteins, but new research suggests that this may not be the only way for life to work.
  • A sophisticated computer analysis revealed that millions of other molecules could be used to function in place of the two nucleic acids, DNA and RNA.
  • The results have important implications for developing new drugs, the origins of life on Earth, and its possible presence in the rest of the universe.
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Who was Jack the Ripper: Four theories on London's most notorious serial killer

New forensic evidence and three other theories on London's most notorious serial killer

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  • Forensic scientists said that they have unveiled Aaron Kosminski, a Polish barber, as Jack the Ripper.
  • Critics say the evidence is too weak to declare the case closed.
  • An earlier genetic analysis of letters sent to the police by Jack the Ripper suggested that the murders could have been committed by a woman.
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