Mysterious bundles of hair have been turning up on streets in Santa Barbara's Mesa neighborhood. It's not known yet if the hair is human, non-human animal, or synthetic. From KEYT:

We reached out to cosmetology workers and those who may have some insights into cultural traditions that involve these hair bundles, but there were no answers...

One resident said she saw some people dropping or throwing smaller ones out of a car window recently, but those are not the ones out there now.

One person on the Mesa saw a resident run into traffic this afternoon, grab one and disappear.

More at Mysterious Universe: "Mysterious Bundles of Hair Appear on California Streets"

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Why do humans have so little hair, at least compared to all other primates? At Smithsonian, Jason Daley shares the latest genetic research on the biological factors that result in humans' minimal body hair and its unusual distribution. Daley also surveys the fascinating current theories about why we evolved into the only naked apes. From Smithsonian:

One popular idea that has gone in and out of favor since it was proposed is called the aquatic ape theory. The hypothesis suggests that human ancestors lived on the savannahs of Africa, gathering and hunting prey. But during the dry season, they would move to oases and lakesides and wade into shallow waters to collect aquatic tubers, shellfish or other food sources. The hypothesis suggests that, since hair is not a very good insulator in water, our species traded in most of our fur for a layer of fat. The hypothesis even suggests we might have developed bipedalism to become more effective waders. But this idea, which has been around for decades, hasn’t received much support from the fossil record and isn’t taken seriously by most researchers.

A more widely accepted theory is that, when human ancestors moved from the cool shady forests into the savannah, they needed better thermoregulation. Losing all that fur made it possible for hominins to hunt during the day in the hot grasslands without overheating. An increase in sweat glands, many more than other primates, also kept early humans on the cool side. The development of fire and clothing meant that humans could keep cool during the day and cozy up at night.

Anthropologist Emma Tarlo just published a new book, Entanglement: The Secret Lives of Hair, investigating the weird culture and business surrounding hair, from Jewish wig parlors to its use in Hindu temples to hair loss clinics. In an excerpt at Smithsonian, Tarlo tells of the hair trade, tracing the path from the growers to the sellers to the buyers:

An Ohio woman who goes by the pseudonym Shelly-Rapunzel sold 38 inches of her ankle-length brown hair on BuyandSellHair.com for $1,800. “All money is going to doctor appointments that have to be paid upfront,” she says. She is not alone. The website is full of women auctioning their hair to the highest bidder. Not all have tales of hardship: some simply want a change of hairstyle; others do it to raise money for specific purposes such as education or charity; others are regulars who use the hair on their heads to bring in some extra cash every few years.

As a hair seller whose identity is at least somewhat known, Shelly-Rapunzel is an anomaly in a largely anonymous world. The gathering of human hair is on the whole a backstage business about which little is known to those outside the trade. Transactions of this sort where named individuals negotiate good deals for their hair make up only a tiny fragment of the billion-dollar trade in human hair...

Much of the hair procured for wigs and extensions on the global market today is collected in bulk by intermediaries in contexts where hair sellers and buyers occupy different social and economic worlds.