Crossword No20
ACROSS
1 Medium-sized antelope of southern Africa (6)
5 Science-fiction “Supermarionation” series first shown in 1964 (8)
9 Electromagnetic radiation with wavelengths longer than those of visible light (8)
10 Seismic movement (6)
11 Psychedelic compound found in some mushrooms (10)
12 Location on the world wide web; place of archaeological exploration (4)
13 2017 book on women and science by Angela Saini (8)
16 Term for a self-sustainable automaton with limited environmental impact (6)
17 Abnormally folded, protease-resistant infectious agents (6)
19 Benjamin ___ (1706–90), US statesman and inventor of the lightning rod (8)
21 In electronics,…
