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Vaccines prevent between 2.5 and 4 million deaths every year.

Did you know?

It is difficult to obtain enough calcium without consuming milk or other dairy foods.

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Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.

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The first successful kidney transplant was performed in 1954 and occurred in Boston. A kidney from an identical twin was transplanted into his dying brother's body and was not rejected because it did not appear foreign to his body.

Did you know?

Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.

Absorption of light energy by an electron Absorption of light energy by an electron
Parallel Light Rays from Distant Objects Parallel Light Rays from Distant Objects
Use the test light to check for voltage at terminal 30 of the relay. The ignition may have to be in ... Use the test light to check for voltage at terminal 30 of the relay. The ignition may have to be in ...
A monochromatic beam of light of wavelength 600 nm is incident normally on a diffraction ... A monochromatic beam of light of wavelength 600 nm is incident normally on a diffraction ...
A land snail (Helix aspersa) with the opening that leads to its lung visible at the left. A land snail (Helix aspersa) with the opening that leads to its lung visible at the left.
Light-independent reactions of photosynthesis Light-independent reactions of photosynthesis
Video: Glomerular filtrate rate: pressures that affect GFR, NFP & GFR and blood composition

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