needle

"If you don't like what you're doing, you can always pick up your needle and move to another groove." -Timothy Leary Up in the night sky, shortly after sunset, the night sky holds some spectacular sights. Some are permanent, some are transient, some have been known for thousands of years, and some are still being discovered. Looking to the west after sunset tonight, this is what you're likely to see. Image credit: Me, using Stellarium, available free at http://stellarium.org. The Big Dipper, perhaps the most famous collection of seven stars in the night sky, looms large over the horizon. As…

The courtship rituals of the spider Harpactea sadistica start innocently enough, with a dance and a hug. The male spider taps the female gently with his front legs and embraces her. But from that point onwards, things for the female go rapidly downhill. The male bites her and she becomes passive, allowing him to manoeuvre her into position. Like all spiders, his genitals are found next to his head, on a pair of appendages called the pedipalps. But unusually, his penis ends in a needle-sharp tip called an embolus. The embolus sits at the end of a loop called the conductor. The male hooks one…