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Crossword No16

ACROSS

1 In biology, a population that is less widespread than in the past (6)

5 Birth city of physicists John von Neumann, Eugene Wigner and Edward Teller (8)

9 Process once crucial in the production of high-grade iron (8)

10 Twofold; of communication, two-way; of printing, double-sided (6)

11 The generic name for polymethyl methacrylate (10)

12 A number that when raised to the power n yields x (4)

13 Boring structure (5,3)

16 Asian antelope also known as the blue bull (6)

17 Planet discovered by Sir William Herschel in 1781 (6)

19 (& 24 Down) Maria ___ (1906–72), Poland-born physicist and Nobel laureate (8,5)

21 The ___, campus newspaper at MIT (4)

22 Surgical removal of breast tissue (10)

25 Marc Isambard ___ (1769–1849), engineer, designer of the Thames Tunnel (6)

26 HO (8)

27 Bird in the curlew group (8)

28 Term describing motion about a fixed axis, as in some kinds of engine (6)

DOWN

2 Identical in magnitude (5)

3 Searchable data set; forefinger (5)

4 Schmitt ___, logic input type that provides hysteresis (7)

5 Probable origin of the universe (3,4)

6 Charles Lutwidge ___ (1832–98), mathematician and author of Euclid and His Modern Rivals; also known as a writer for children (7)

7 Fastener developed in the 19th century by the Gem Manufacturing Company (5,4)

8 Chungkingosaurus or Wuerhosaurus, perhaps (9)

14 One of a set of 17 elements that includes Ce and Y (4,5)

15 A 14 Down, atomic number 57 (9)

18 Musical instrument used to manipulate sound recordings (7)

19 Low-ethanol fuel mixture (7)

20 Device for the perusal of electronic books (1-6)

23 Kilgore ___, fictional sci-fi writer created by Kurt Vonnegut (5)

24 See 19 Across