Shadows and facts

Trolling the web for a few things to consider:

Why do leaves change color in the fall? Because as the days become shorter and cooler, there is not enough light or water for photosynthesis. The green chlorophyll disappears from the leaves, and they change to yellow and orange.

Butterflies can only fly if their body temperature is above 86 degrees. They sun themselves to warm up in cool weather until they are warm enough to fly.

Many say a cat purrs because they are contented and happy. But a cat also purrs when it is injured and in pain. It has been suggested by some scientists that purring, with its low frequency vibrations, is a "natural healing mechanism."

You can estimate the outdoor temperature by listening to how often a cricket chirps. To get a rough idea of the temperature in degrees Fahrenheit, count the number of chirps in 15 seconds and then add 37. The number you get will be an approximation of the outside temperature.

The light from a lighthouse can be seen for long distances because it is a concentrated beam of light. Fresnel lenses are used to capture the light particles and funnel them into very high intensity light.

Some scientists think the word "fact" should be banished, and that "theory", "observation" and "experimental data" should be used instead when discussing scientific phenomena. That we, perhaps, become closer to the truth as certain theories are proved false.

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There are no facts, only interpretations.
-Freidrich Nietzsche

If the facts don't fit the theory, change the facts.
-Albert Einstein

Beauty is a form of genius -- is higher, indeed, than genius, as it needs no explanation. It is of the great facts in the world like sunlight, or springtime, or the reflection in dark water of that silver shell we call the moon.
-Oscar Wilde