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ACROSS
8 Symmetrical plane curve (8)
9 Os (6)
10 Valentina ___ (b.1937), cosmonaut (10)
11 Eukaryotic organism such as kelp (4)
12 Absence of oxygen (6)
14 The study of motion and energy (8)
15 Joseph ___ (1768–1830), French mathematician (7)
17 Capable of sustaining a nuclear fission chain reaction (7)
20 Star in a late phase of evolution (3, 5)
22 To form bone (6)
24 “The value of an ___ lies in the using of it” – Thomas Edison (4)
25 Nerve response (4, 6)
27 Inflammatory disease of the airways (6)…
