Not the usual linkdump related to a particular topic, but interesting nonetheless. Also, not technically Tuesday here anymore, but close enough.
A 10-11th grade student has built a flashlight powered by the heat from your hand, that can produce 24 lumens.
The article talks slightly dismissively about a mere 24 lumens, but that's what my Streamlight spits out on low. That's plenty, if the alternative is "no lumens". I'd certainly carry one if I could get a tiny one.