• Video clip: Full moon

    Video clip: Full moon
    On August 28, the second total eclipse occurred in 2007. The moon was completely obscured at about 10:37 GMT (17:37 Hanoi time), corresponding to the early evening at Sydney,
  • Ship history (part 1)

    Ship history (part 1)
    From the end of the 18th century and earlier, sailboats were transported by sea breeze while the wind blew erratically. People have thought of using a constant source of energy