Planetary Gears In Practice
I've long been fascinated by the possibilities of full-spectrum light - light that can improve mood and wakefulness, especially in winter when sunlight is in short supply. When I discovered that inexpensive, full spectrum light bulbs were up for sale online, I quickly bought a set. Once I took their measurements, I began sketching up a lamp that could feature them - and check their intensity. The final product was gifted to my dad.