Topic: Light

Science

Polar Bears’ White Fur

Animals Diversity and Adaptation Light Marine Biology

Polar bears live near the North Pole, a frigid region covered by white ice and snow. The bears are protected by their thick, white fur. But what makes a polar bear’s fur white? In this episode of Earth Rangers, an expert on polar bears reveals that the hair of polar bears is actually translucent, with only small amounts of white pigment. Listen to a scientist explain what is responsible for the white color of polar bears’ fur—and why the fur sometimes changes color.

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Current Event July 24, 2019

Star Gazing Parties

Technology Environment Space Systems Human Impacts Astronomy Light

Far from the bright lights of cities and suburbs, amateur astronomers gather to stargaze in the dark at events known as “star parties.” Stargazers enjoy sharing the experience with others who are passionate about dark skies and the faraway places they make visible. Listen to hear about what happens at star parties and what amateur astronomers are viewing in the dark night sky.

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Current Event February 11, 2016

LiFi vs WiFi

Technology Physical Science Light

Li-Fi is a lot like Wi-Fi, but it uses light to transmit data. In tests, it is 100 times faster than an average home Wi-Fi connection. Li-Fi uses LED lights to transmit data and these lights can become communication devices. The spectrum is larger and slow downs that are often seen in Wi-Fi are not an issue. Listen to hear more about this exciting invention.

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