ღ Rainbows ღ

ღRainbows, such as this one produced by artificial light shone on an icy Niagara Falls, are just one special effect of light, a marvel that reveals the world to us. Light sets our biological clocks; triggers in our brains the sensation of colour; feeds us (supplying energy for plants to grow); gives us life-changing tools (incandescent bulbs, lasers and fibre optics). Scientists don't fully understand what light is or what it can do, they just know it will illuminate our futureღ

ღRainbow over Pennsylvanian soybean fields. Water refracts, or bends,
the light, separating it into red, orange, yellow, green, blue, and violetღ

ღA double rainbow hangs over the Alaska Highway in British Columbia, Canadaღ

ღA rainbow is reflected in the icy arctic waters in Canada's Foxe Basinღ

ღA fisheye lens captures arcs of light crowning the Canadian wilderness99ღ

ღRainbows frame a peculiar lava formation at Ol Doinyo Lengai, a volcano in Tanzaniaღ

ღA double rainbow frames termite mounds in Australia. Double arcs happen
when light is reflected more than once in an atmospheric water dropletღ

ღPainted Hills National Monument, Oregon, near sunset, a rainbow on a 100-degree dayღ