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Ultraviolet Light

Ultraviolet light is a form of radiation which is not visible to the human eye. It's in an invisible part of the 'electromagnetic spectrum'. Radiated energy, or radiation, is given off by many ... Continue reading

Images from the EIT (Extreme-ultraviolet Imaging Telescope) instrument on the SOHO spacecraft.

Does Your Brain Do Flips?

You may not be aware of it, but when you look at the world, the image projected on your retina is upside down. This is due to the optics used by our eyes. Our brain compensates for this upside down ... Continue reading

Normal Sight: Normal ray tracing of light to the retina. Shows image will 'flip'.

With Pinhole: Ray tracing of pin through pinhole; a shadow is cast on the retina.

Newton's First Law of Motion

Sir Isaac Newton first presented his three laws of motion in the 'Principia Mathematica Philosophiae Naturalis' in 1686. His first law states that every object will remain at rest or in uniform motion ... Continue reading

The story of Isaac Newton discovering the laws of gravity by watching apples falling from a tree is probably just a myth. He did do his work on gravity while at a farm, but that is about as much as can be proven.