How Life Became Left-Handed [Forum Archive]

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How Life Became Left-Handed

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Posted by: min0 lee

How Life Became Left-Handed | LiveScience

Lefties are just 11 percent of the world population. But take a close look at anyone's amino acids, which are protein's and thus life's tiny building blocks, and left-handers rule.
Left-handed amino acids are mirror images of their right-handed buddies, and though similar, the mirrored molecules are chemically different. For some reason, nearly every single organism exclusively relies on lefties.
Why does life discriminate on a molecular level? Neutron starlight might have zapped amino acids riding on comets and asteroids into a bias, and a little water might have concentrated them after they crashed into Earth, a team of scientists now say.......more here

Posted by: min0 lee

Left-handed and right-handed amino acids, where the "R" stands for the part that makes each different - but the position of atoms in the molecules matter, too. Nearly all amino acids produced and used by organisms on Earth are lefties. Credit: NASA/JPL

Posted by: DOMS

Fun fact: 4000 left-handed people die each year using tools designed for right-handed people.

Posted by: min0 lee

Quote:

Originally Posted by DOMS

Fun fact: 4000 left-handed people die each year using tools designed for right-handed people.

I believe it.

Any lefthanders here?

Posted by: IainDaniel

7% percent of golfers are lefthanded.

in Canada 25% of golfers are left handed.

Posted by: IainDaniel

Was a lefty. But my teacher changed me when I was a kid.... damn superstitions. pretty close to ambidextrous now

Posted by: Rubes

im ambidextrous. i write with my left hand most of the time but play sports right handed

Posted by: JailHouse

Quote:

Originally Posted by IainDaniel

Was a lefty. But my teacher changed me when I was a kid.... damn superstitions. pretty close to ambidextrous now

Same thing happened to me in elementary school. It fucks me up when I play baseball because I can catch with ether hand but my body position can mess me up more.

Posted by: Little Wing

after a number of strokes that impaired manual dexterity in his right hand Frank Frazetta switched to painting with his left hand.

Posted by: Little Wing

my father and Tesla are lefties.

Posted by: Built

Quote:

Originally Posted by DOMS

Fun fact: 4000 left-handed people die each year using tools designed for right-handed people.

Quote:

Originally Posted by IainDaniel

7% percent of golfers are lefthanded.

in Canada 25% of golfers are left handed.

This is because we cannot afford power tools...

Posted by: tomuchgear

i am ambidextrous as well had to learn. way to many broken bones to not learn.

Posted by: DaMayor

I'm bisexual...I can use either hand to.....oh, wrong forum. Sorry.

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