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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.

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Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.

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The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).

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The highest suicide rate in the United States is among people ages 65 years and older. Almost 15% of people in this age group commit suicide every year.

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In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.

Three routes of tissue-level transport in plants: transmembrane, symplastic, and apoplastic. Three routes of tissue-level transport in plants: transmembrane, symplastic, and apoplastic.
(a) The Dmanisi cranium (right) shows similarities to early African H. erectus including the Narioko (a) The Dmanisi cranium (right) shows similarities to early African H. erectus including the Narioko
(A) Thumb slide down nose to (B) St-2. Press points along the cheekbone: (C) LI-20, (D) St-3, (E) ... (A) Thumb slide down nose to (B) St-2. Press points along the cheekbone: (C) LI-20, (D) St-3, (E) ...
The Nile Delta will be strongly affected by a rise in sea level of 50 cm The Nile Delta will be strongly affected by a rise in sea level of 50 cm
The level of emissions from transport in the United States is twice as high as the global average The level of emissions from transport in the United States is twice as high as the global average
The tertiary level of protein structure for the respiratory pigment myoglobin The tertiary level of protein structure for the respiratory pigment myoglobin
Video: Kinetic parameters & Kinetic experiment

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