The joy of science: Part 3 of 5

pt. 3: lecture 25. Properties of materials

lecture 26. Semiconductors and modern microelectronics

lecture 27. Isotopes and radioactivity

lecture 28. Nuclear fission and fusion reaction

lecture 29. Astronomy

lecture 30. The life cycle of stars

lecture 31. Edwin Hubble and the discovery of galaxies

lecture 32. The big bang

lecture 33. The ultimate structure of matter

lecture 34. The nebular hypothesis

lecture 35. The solar system

lecture 36. The Earth as a planet.