How on Earth Did They Do That?

1. A Matter of Self-Defense1974-01-07 2. Bird Brain - The Mystery of Bird Navigation1974-01-14 3. Never Too Late to Learn1974-01-21 4. The Great Fish Hunt1974-01-28 5. Pedal Power1974-02-04 6. The Writing on the Wall1974-02-11 7. Where Did the Colorado Go?1974-02-18 8. The Future Goes Boom1974-03-04 9. Fusion: The Energy Promise1974-03-11 10. The First Ten Years1974-04-22 11. This Yankee Dodge Beats Mesmerism Hollow1974-04-29 12. The Hunting of the Quark1974-05-06 13. A Noah's Ark for Europe1974-05-13 14. Bridges: When It Comes to the Crunch1974-06-03 15. Search for Life1974-06-10 16. The Secrets of Sleep1974-06-10 17. Who Needs Skills?1974-06-24 18. Hills of Promise1974-07-01 19. The Race for the Double Helix1974-07-08 20. The Immigrant Doctors1974-07-15 21. Mines, Minerals and Men1974-07-22 22. What Price Steak?1974-07-29 23. Listen and Be Loyal1974-08-05 24. Adam or Eve?1974-08-12 25. An Unholy Scramble1974-09-02 26. Do as You Are Told1974-10-28 27. The First Signs of Washoe1974-11-04 28. The Other Way1974-11-11 29. The Greatest Advance Since the Wheel?1974-11-25 30. Joey1974-12-09 31. The Neglected Harvest1974-12-16 32. How on Earth Did They Do That?1974-12-23 33. The Lysenko Affair1974-12-30