Here’s a whirlwind tour of some of my favorites. On that list are a POV holographic display, giant cast-resin LEDs, an optical-pump ruby laser built out of parts from AliExpress, blinky goodness ...

Roditi is a specialist European distributor of laser rods and crystals, from Nd:YAG, CTH:YAG ruby and Ti:Sapphire, to lithium niobate and lithium tantalate . We also offer optical components, quartz ...

Musician Rod Stewart is a father to Sarah, Kimberly, Sean, Ruby, Renee, Liam, Alastair Wallace and Aiden Patrick Emma Kershaw is a contributing writer at PEOPLE. She has been working at PEOPLE ...