Sari on Science: Make your own LED light-up greeting card

A LED light-up greeting card is a fun, easy way for kids to start exploring circuits, while lighting up someone's day.

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DIY: How to Make a Light Up LED Greeting Card with Copper Tape

You can learn a lot about cities by how they light up at night - Vox

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What are glow sticks, and what's the chemical reaction that makes them light up?