Solution to puzzle 10685

Across

1 “14 12” and “11 8” has altered our understanding of all that exists (8)

5 Fearful of a head-on, forceful attack (6)

9 Skillfully completed and thoroughly cooked (4,4)

10 Push for training by student (6)

12 Key, perhaps to science’s primary rate of progress? (5)

13 Lamenting blunder in arrangement (9)

14 Twisted villain initially interrupting treatment with some deviousness (6)

16 The Spanish firm admits oddly garbed renaissance painter (2,5)

19 Dexterity of the Parisian introduced in show (7)

21 Right away, share the magic medicine (6)

23 Betters return on investment sending back wood shavings for packaging (9)

25 Faint after a shortwhile outside work (5)

26 Unsatisfactory conclusion to cause displeasure (6)

27 Ultimate belief in a utopian system (8)

28 Late to get back, quietly slipped in and ran (6)

29 Critical analysis of sex, is gee, disturbing! (8)

Down

1 Foolish one going after a French woman on the banks of Seine (6)

2 Irritable disposition from unhealthy environment (3,6)

3 Invest excessive energy to supplant union leader (5)

4 Twenty per cent of supernovas are pulled back towards our brightest star (7)

6 Keep defender, say, for a couple of weeks (9)

7 Newton’s inspiration is big in New York (5)

8 Lengthy discussion on cover-up of measure to release Carbon (8)

11 Release overturned for now, perhaps? (4)

15 Questionable, leaving it to a self-appointed policeman (9)

17 Regularly choose income to be distributed for financial considerations (9)

18 Minor planet, star-shaped, circling around earth is half-barren (8)

20, 21 Double contradiction in a hypothetical situation where one sibling ages faster? (4,7)

22 To begin any negotiation, it’s essential to cut short hostility (6)

24 Without a trace of sound, drags shackles (5)

25 Girls from the south describing northern jargon (5)