light
Latest about light
![Energy saving light bulbs being put in a ceiling light](https://cdn.mos.cms.futurecdn.net/LAmFyWyh2vmhu47Hv9pf7o-320-80.jpg)
How do energy saving light bulbs work?
By Mark Smith published
Reference Energy saving light bulbs: mechanics, efficiency and designs
![An eye](https://cdn.mos.cms.futurecdn.net/eATWpPkiLfbvBh8naxMLiH-320-80.jpg)
Your pupils can count … sort of
By Yasemin Saplakoglu published
New research suggests a person's pupil size can change based on the number of objects an individual observes in their visual field.
![What would happen if light traveled much more slowly?](https://cdn.mos.cms.futurecdn.net/cLEQTjZrCGc4txwkhwEKFF-320-80.jpg)
What would happen if the speed of light were much lower?
By Ashley P. Taylor published
Here's what would happen if the speed of light were orders of magnitude slower.
![Space as seen from Earth's surface](https://cdn.mos.cms.futurecdn.net/F9gD5hvUSeAaYt5h4MiJzb-320-80.jpg)
Why does outer space look black?
By Tiffany Means published
Several cosmic characteristics, including the lack of an atmosphere, lend space its dark color.
![Sombrero Galaxy](https://cdn.mos.cms.futurecdn.net/uzaeAXxXda3jwojAdAvHxh-320-80.jpg)
Amazing astrophotography: How some of the most iconic space images were captured
By Ailsa Harvey, How It Works magazine published
These incredible space photos were taken using advanced techniques to reveal some of the wonders in the universe.
![12 spheres sit on a field of green, red and blue stripes, with some stripes crossing in front of the spheres](https://cdn.mos.cms.futurecdn.net/wNcRvG84RnMWkTAPM5twrR-320-80.jpg)
This optical illusion tricks you into seeing different colors. How does it work?
By Nicoletta Lanese published
This image is an example of the Munker-White illusion.
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