Readers offer their best tips for building your own 3D projector, coordinating group photos for events, and studying more effectively. Every day we receive boatloads of great reader tips in our inbox, ...

Technically, this simple DIY project doesn’t produce a hologram, but the results look very similar. The idea is to create a pyramid of transparent, reflective material with the point facing down onto ...

Anyone with a CD jewel case, office supplies and about 10 minutes to spare can turn their smartphone into a 3D hologram projector thanks to an instructional video on YouTube. The video, posted on 1 ...