The video shows the metalens depth sensor working in real-time to capture the depth of translucent candle flames. The two images on the left are the raw images captured on the camera sensor. They are ...

1. Ask the adult you are working with to light the candle. 2. Watch the candle flame start out small and get bigger. Notice how some of the wax near the wick melts. 3. As the flame burns, the wax from ...

If you tilt a candle sideways, why does the flame turn and keep pointing up? asks a reader. Think of the flame on a candle as a helium-filled balloon: No matter which way you hold the string or the ...