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A flat lens made of a number of concentric rings, to reduce spherical aberration.
No. The event horizon of a black hole is spherical.
In early centuries they really believed that. Gallileo and the seafaring explorers proved it was true the world was not flat and you would not fall off it. Today we enjoy seeing the beauty of our round planet Earth from space cameras and from photos taken by the astronauts and the satellites. They are spectacular photos. NASA has a web site with some of those photos and videos. Go see them sometime.
Water contains distilled water which gives it taste. In disstilled water, these minerals are missing causing it to taste flat.
Even though the earth is round, or more specifically, spherical, it seems flat to the human eye. This is because the earth is so huge that when we look at it we can't take in all of the horizon because we are so close. If we were viewing the earth from the moon, we would clearly be able to see it is spherical.
Surface tension attracts water molecules inward.
Surface tension attracts water molecules inward.
Surface tension attracts water molecules inward.
Surface tension attracts water molecules inward.
Surface tension attracts water molecules inward.
Surface tension attracts water molecules inward.
Surface tension attracts water molecules inward.
The reason why water makes a (more or less) spherical shape on wax paper rather than just spreading out into a thin layer, is that water has a greater attraction to itself, than it does to wax paper. Water's self-attracting property is known as surface tension.
Cartographers an represent the spherical Earth on flat paper by making a projection, which is like casting shadows from the spherical world onto a flat piece of paper.
Projection
Because people have seen it from space and anyway if the Earth was flat all the water would fall of the edge so then we would not survive
Spherical but also flat on the top and bottom