Bosch hand-held cordless vacuum cleaner, GAS 18V-1

This is a nice stand alone product not compatible with anything but batteries.

XKCD highlights

XKCD.COM has some nice strips.

A small rethought guide on calculating the day of week fairly easily

Here Is a small guide in Disqus-formatting, that I have ‘published’ several times on the old GSMArena.com blog (with tiny variation).

UPDATE: Should in 2019 finally be more or less obsolete for wide enough windows!

Lightning up briquettes in a wood burning stove the top-down way, does not have to be complicated!

For some reason, surprisingly few know this extremely simple formula, please share it.

I have actually seen in a carpet store an employee unrolling the carpet to measure the length!!

[The formula is simple to prove too… r=kφ, L=∫r dφ=∫kφ dφ=½k(φ₂²-φ₁²)=½k(φ₂+φ₁)×(φ₂-φ₁)=½(r₂+r₁) ×n2π=(r₂+r₁) × nπ , q.e.d.]