Puzzle Answers June 2017
6 Jun 2017 by qmwwwtqmqt.d qmwwwtqmqt.d
ACROSS: 1 Centrifuge 6 Wolf 10 Plastic 11 Rouleau 12 Epithelia 13 Bidet 14 Stelliferous 18 Atomic number 23 Tyson 24 Blameless 26 Laminar 27 Antigen 28 Marl 29 Thermostat. DOWN: 1 Copper 2 Niacin 3 Ratchet 4 Focal 5 Germanium 7 Open door 8 Fructose 9 Bubble 15 Lindbergh 16 Tantalum 17 Gossamer 19 Inning 20 Electro 21 Weight 22 Usenet 25 Adair.
The surface of a stinging nettle leaf, showing stinging hairs. The large stinging hairs are hollow tubes with walls of silica making them into tiny glass needles. The bulb at the base of each hair contains the stinging liquid that includes formic acid, histamine, acetylcholine and 5- hydroxytryptamine (serotonin). The tips of the glassy hairs are very easily broken when brushed, leaving a sharp point, which easily pierces the skin to deliver the sting.
Credit: Liz Hirst, Medical Research Council, Wellcome Images
