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Did you know?

Vaccines prevent between 2.5 and 4 million deaths every year.

Did you know?

Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.

Did you know?

Excessive alcohol use costs the country approximately $235 billion every year.

Did you know?

Asthma attacks and symptoms usually get started by specific triggers (such as viruses, allergies, gases, and air particles). You should talk to your doctor about these triggers and find ways to avoid or get rid of them.

Did you know?

There are 60,000 miles of blood vessels in every adult human.

A depiction of a platypus from a book for children published in Germany in 1798 A depiction of a platypus from a book for children published in Germany in 1798
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Video: Chloroplast Structure & Light Dependent Reactions (Photosystem 1 and 2 Cyclic Electron Flow)

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