Quick crossword #43: the constellation Antlia (3,4)

Quick Crossword #43

ACROSS

1 Biologist and president of Humanists UK (5,7)

10 South Korean social network (7)

11 Turn to vinegar (7)

12 Dolphin genus; bacterium (informally) (5)

13 Heavy-lift helicopter (8)

15 Irregular heartbeat (10)

16 Mineral, Mg₃Si₄O₁₀(OH)₂ (4)

18 Palm tree, Euterpe oleracea (4)

20 Tropical cyclone that struck Japan in 1990 (7,3)

22 Aromatic herb (8)

24 Consonantal alphabet (5)

26 Tidal wave (7)

27 Ettore ___, automobile designer (7)

28 Pr (12)

DOWN

2 1st or 2nd, say? (3,4)

3 ___ group, COOH (8)

4 ctrl+Y…