Color is Not a Physical Characteristic The picture shows me and my granddaughter sitting in a field of bluebonnets. The sky over head is a bright blue with a floating lazy cumulus cloud. But it is what is not seen that creates a totally different scene. A fraction of a second after the camera [...]

Vision Depends on Visible Light Everything you see, if it isn’t a source of light,  depends on reflected light. Light is necessary for vision, but what you see depends on how your brain perceives the light. Light is a form of electromagnetic energy that moves in wave-like patterns. YES! Light is necessary for vision, but [...]

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Why is Human Blood Red? Why Do Veins Under the Skin Look Blue? Human blood has two parts, liquid and solid. Liquid: About 50 to 60 % of your blood is a yellowish liquid called plasma. Plasma is a solution made up of water (solvent)  and solutes, such as glucose, vitamins, minerals, antibodies, and all [...]

Free radicals are substances that have unpaired electrons. These substances act like “electron scavengers,” in that they snatch away electrons from other chemicals, thus turning these chemicals into free radicals on the prowl for electrons. This ongoing robbing of electrons can result in damage to critical chemicals needed for life processes. Antioxidants are molecules that [...]

Color is the perceived image of a surface determined by the wavelength of light reflecting from the surface. The color of a flower depends on who or what is viewing the flower. The top photo show the flowers as perceived by a person with color vision. The bottom photo shows the pattern revealed to bees, [...]

Respiration is more than just breathing. In fact, while breathing is necessary to supply oxygen, the respiration process has three sets of chemical reactions: glycolysis; the Krebs cycle, or the citric acid cycle; and the electron transport system. Each of the three parts of respiration is carried out in every cell of your body. Respiration [...]