This part is not complete yet. The stories with no link will be added later.

• ps pdf How Newton `revealed' to Leibniz his main discovery in mathematics
• How Bernoulli and Leibniz tested what Newton really knew (the brachistochrone problem).
• Light I Reflection. The earliest discovery about the nature of light
• Light II How to rescue drowning people, and how Pierre Fermat `explained' refraction (Last update 9/12)
• Little Jo and her pig (Solution posted 10/21)
• Airplane and the wind (Solution posted 10/21)
• Gravity Train Project (Solution posted 10/21)
• The Fastest Gravity Train (TGV brachistochronique, as it is called on the other end)
• Brief history of clock making and of the problem of longitude (Posted 9/11)
• How to make better clock I ( pendulum)
• How to make better clock (tautochrone pendulum)
• How clocks work (according to Andronov, Vitt and Khaikin)
• Claude Ptolemy and his `Almagest'
• Kepler and his laws
• Who discovered the Universal Law of Gravity, and what does it mean `to discover'.
• Newton's Principia, volume 1 (abridged).
• How to make steam engines
• Why the first transatlantic cable failed
• How to chase the U-boats (Solution posted on 10/21)
• Can differential equations save your life?
• String with beads
• Why airplanes fly and ships sail