In this week's interesting facts edition: Hippo Sweat, A Hardy Mars Rover, If the Moon Didn't Exist, Airplanes Hitting Fish, and Banned Selfie Sticks.

In this week's interesting facts edition: Hippo Sweat, A Hardy Mars Rover, If the Moon Didn't Exist, Airplanes Hitting Fish, and Banned Selfie Sticks.

The Red Sweat of Hippos by Yoko Saikawa et al.: Within a few minutes of perspiration, the colourless, viscous sweat of the hippopotamus gradually turns red, and then brown as the pigment polymerizes and may act as both an antibiotic and sunscreen. #Hippo #Sweat #Yoko_Saikawa #wild #animals

The Red Sweat of Hippos by Yoko Saikawa et al.: Within a few minutes of perspiration, the colourless, viscous sweat of the hippopotamus gradually turns red, and then brown as the pigment polymerizes and may act as both an antibiotic and sunscreen. #Hippo #Sweat #Yoko_Saikawa #wild #animals

Hippos can stand in the hot sun all day without getting a sunburn, and now researchers know why: a red-colored glandular secretion known as "hippo sweat" contains microscopic structures that scatter light, protecting the hefty mammals from burns, according to a new study.

Hippos can stand in the hot sun all day without getting a sunburn, and now researchers know why: a red-colored glandular secretion known as "hippo sweat" contains microscopic structures that scatter light, protecting the hefty mammals from burns, according to a new study.

Did you know that hippos sweat red?   Their sweat actually protects against sun damage and prevents the growth of bacteria on the skin. This properties probably evolved from the need to protect them from the harsh sunlight they spend their days in. It also helps to heal and prevent infection in wounds, which is useful in a species that fights as much as they do. Basically, they've evolved a colorful antibacterial sunscreen!    Shutterfly | Science Is Awesome photo

Did you know that hippos sweat red? Their sweat actually protects against sun damage and prevents the growth of bacteria on the skin. This properties probably evolved from the need to protect them from the harsh sunlight they spend their days in. It also helps to heal and prevent infection in wounds, which is useful in a species that fights as much as they do. Basically, they've evolved a colorful antibacterial sunscreen! Shutterfly | Science Is Awesome photo

Do Hippos Sweat Blood? - Red Hippopotamus Sweat: The hippo mystified ancient Greeks because it appeared to sweat blood. Although hippos do sweat a red liquid, it isn't blood. The animals secrete a sticky liquid that acts as a sunscreen and topical antibiotic.  Initially, hippo perspiration is colorless. As the viscous liquid polymerizes, it changes color to red and eventually brown. Droplets of perspiration resemble drops of blood, although hippo perspiration sticks to the animal's wet skin.

Why Hippos Appear To Sweat Blood

Do Hippos Sweat Blood? - Red Hippopotamus Sweat: The hippo mystified ancient Greeks because it appeared to sweat blood. Although hippos do sweat a red liquid, it isn't blood. The animals secrete a sticky liquid that acts as a sunscreen and topical antibiotic. Initially, hippo perspiration is colorless. As the viscous liquid polymerizes, it changes color to red and eventually brown. Droplets of perspiration resemble drops of blood, although hippo perspiration sticks to the animal's wet skin.

A hippo's sweat is red in color, but it's not their blood.

A hippo's sweat is red in color, but it's not their blood.

The really clever thing about hippos is that they produce their own sunscreen, in the form of a sticky reddish sweat.

The really clever thing about hippos is that they produce their own sunscreen, in the form of a sticky reddish sweat.

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