61.   Researchers know that the pineal begins squirting melatonin into the blood at dusk and stops at dawn.

62.   Researchers now know, for example, that sign languages are as grammatically sophisticated as spoken ones.

63.   Researchers already knew how to force tiny molecules to bind to larger ones to create a big foreign substance the immune system could not miss.

64.   Researchers knew the parasites carried their own DNA inside the nucleus, as well as DNA inside their mitochondria, the energy-producing organelles of the cells.

65.   Researchers knew they were holding a firecracker.

66.   Researchers know that chemicals which behave like estrogen can cause health problems.

67.   Researchers know that half of adult diabetics are undiagnosed.

68.   Researchers know that strandings occur because an animal is ill, injured or old.

69.   Researchers know that the gene is normally active in the retinal cells known as rods, where it controls the production of a molecule called a transporter.

70.   Researchers know that, if people are brought close together, they tend to push on each other.