I've seen some nice experiements that demonstrate Air pressure.
The first is the classic double-hemisphere. Take two cast-iron hemispheres (I assume you'd need to buy these somewhere). Show that the rims are not sticky, magnetic and do not lock in any way. Now evacuate them and see if anyone can pull them apart. I believe the original experiment failed to pull them apart even with a team or four strong horses.
The second is simpler. Lie a wooden ruler over the edge of a bench so a good few inches overhang. Now place a single sheet of broadsheet newspaper on the bench, covering the ruler. Which is stronger, the paper or the ruler? The ruler, right? Whack the free end of the ruler with a hammer and watch the amazed faces.
Does anyone bang in random URLs containing a search word as a means of finding sites?
Not me. One of the problems is the proliferation of "Adult" sites. Looking for information on the Avian Species Parus major during your lunch break? Would you seriously start at www.greattits.com? Or you want to buy a present for your wife; www.big-jugs.com
OK, these are fairly obvious ones, but you'd be suprised at some fairly innocuous-sounding domains that point to pr0n.
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I've seen some nice experiements that demonstrate Air pressure.
The first is the classic double-hemisphere. Take two cast-iron hemispheres (I assume you'd need to buy these somewhere). Show that the rims are not sticky, magnetic and do not lock in any way. Now evacuate them and see if anyone can pull them apart. I believe the original experiment failed to pull them apart even with a team or four strong horses.
The second is simpler. Lie a wooden ruler over the edge of a bench so a good few inches overhang. Now place a single sheet of broadsheet newspaper on the bench, covering the ruler. Which is stronger, the paper or the ruler? The ruler, right? Whack the free end of the ruler with a hammer and watch the amazed faces.
Does anyone bang in random URLs containing a search word as a means of finding sites?
Not me. One of the problems is the proliferation of "Adult" sites. Looking for information on the Avian Species Parus major during your lunch break? Would you seriously start at www.greattits.com? Or you want to buy a present for your wife; www.big-jugs.com
OK, these are fairly obvious ones, but you'd be suprised at some fairly innocuous-sounding domains that point to pr0n.