91av

Crossword No21

ACROSS

1 Part of the female reproductive mechanism of a flower (6)

4 Rumen, reticulum, omasum and abomasum, for instance (8)

10 Grass fibre from the Mediterranean region (7)

11 1985 sci-fi novel by Carl Sagan (7)

12 The only even prime number (3)

13 Irene ___ (1897–1956), joint winner of the 1935 Nobel Prize for Chemistry (6-5)

14 Three-part brain structure first proposed by Paul D. Maclean (6)

15 Condition that may be congenital, chronic or idiopathic (7)

19 Human-like automaton (7)

20 In electronics, a valve composed of three electrodes (6)

23 Traits developed by evolution in response to environmental factors (11)

25 Extinct bird of New Zealand (3)

26 Oceanographical feature also called a shoal (4,3)

27 New World woodpecker (7)

28 Portable mechanical cutting tool first developed for use in surgery (8)

29 Theoretical means by which a memory is stored in the brain (6)

DOWN

1 In geology, another name for soapstone (8)

2 Mechanical process by which an object collapses in on itself (9)

3 Smithsonian zoologist (1860–1943) who described more than 1000 new species (4,4,7)

5 Relating to the structure of Earth’s crust (8)

6 Obsolete name for bipolar disorder (5,10)

7 Electric ___, execution device conceived by US dentist Alfred P. Southwick (5)

8 Joe ___ (1921–2016), “father of the 747” jumbo jet (6)

9 ___’s Law, principle relating to gas pressure (5)

16 Carolyn ___ (b.1929), US astronomer who discovered 377 minor planets (9)

17 Genus of bacteria that can cause serious illness in humans (8)

18 Six-pointed star shape (from the Greek) (8)

21 pc (6)

22 Heinz ___ (1928–2017), German-born scientist known for presenting The Great Egg Race on the BBC (5)

24 Suspension of breathing (US spelling) (5)