2. What fallacious claim did Bohr initially make about fission?
(a) It cannot be used to produce weapons
(b) The Americans must master it
(c) Cadmium is unnecessary
(d) Germany will never understand it

3. Who is the elder of the scientists?
(a) They are the same age
(b) Heisenberg
(c) Bohr
(d) It is unclear

4. Where do Heisenberg and Bohr go first on their latest visit?
(a) Heisenberg’s office
(b) Bohr’s home
(c) Bohr’s office
(d) For a walk in the park

5. What metaphor does Margrethe use for their unanswered questions?
(a) Books
(b) Table tennis
(c) Ghosts
(d) Skiing

6. In what month did the 1914 meeting actually take place?
(a) October
(b) November
(c) September
(d) December

7. Why is Heisenberg not in touch with the English physicists?
(a) Communications methods aren’t sophisticated enough
(b) They are ignoring him
(c) He has fallen out with them
(d) Their countries are at war

8. How does Heisenberg refer to Weizsacker?
(a) Your friend
(b) Your enemy
(c) Our enemy
(d) Our friend

9. How has Bohr been treated by the occupying Germans?
(a) They have become his friends
(b) They have ignored him
(c) They have coddled him
(d) They have abused him

10. What does Heisenberg imply Weizsacker might have told Bohr?
(a) He must hide his work from Margrethe
(b) He needs to flee Denmark
(c) Heisenberg wants to make amends
(d) He would find protection at the German embassy

11. Where did Bohr have his most important insight, according to Heisenberg?
(a) Princeton
(b) Columbia
(c) Oxford
(d) Chicago

12. What uranium isotope is least common?
(a) U-235
(b) U-238
(c) U-17
(d) U-2.

13. Why is Heisenberg envious of Bohr?
(a) Bohr has many children
(b) Bohr has his own institute
(c) Bohr has access to a cyclotron
(d) Bohr has an article about to be published

14. What happened after the SS brought Heisenberg in for questioning?
(a) They let him go
(b) They put him in a concentration camp
(c) They used him as a spy
(d) They beat him

15. Who accompanied Heisenberg on his 1947 trip to Copenhagen?
(a) His wife
(b) A Gestapo officer
(c) A British intelligence minder
(d) His son