The world population is expected to reach seven billion within the next few days. Wonder what number you are? A calculator from the BBC helps you find out approximately where you fit in. I have a relatively low number, as there weren’t even three billion people when I was born. Link -via Breakfast Links

Crazy Calculator

Have you heard about the Crazy Calculator, the calculator that hates math? It’s both a prank calculator and a real calculator! When your friends are around, use it in prank mode. Whatever equation you enter, the answer will come up crazy: I H8 MATH, ASK NICELY, TRY LATER, WHO CARES, GO AWAY, and more! But when you really need an answer, switch it to normal mode and get the correct answer. Sweet! It’s solar powered with battery backup and has an automatic shut off timer. Get your Crazy Calculator today at the NeatoShop!

And check out all the other prank toys and gifts at the NeatoShop!

If I lived on Neptune I would be less than a Neptune year old, how old would you be?  This nifty calculator allows you to figure out your “age” on different planets (including dwarf planet Pluto). Every grade school student knows we measure years by how long it takes the Earth to travel around the Sun. However it’s interesting to think how time measurement would be different if we lived on a world like Mercury that takes only 88 Earth days to travel around the sun. Link

Water-powered battery consists of two electrodes made of special alloys, which, when immersed in water, produce electricity through a chemical reaction.

Simply refill the battery as the water evaporates – typically every 2 to 3 months. The battery has a minimum continuous life of 2 years.

Fun and educational – From the NeatoShop: Link | More fun Back To School Items

Retro Calculators is a web museum of mechanical calculating devices, such as slide rules and adding machines. Its YouTube channel includes videos of these machines in use, including the above Faber Castell Addiator. This is a gadget that combines a slide rule with an adding and subtracting device.

Link via View from the Porch | YouTube Channel

The Inverse Graphing Calculator takes words and converts them into equations that would express them graphically:

The Inverse Graphing Calculator (version beta-1) is like a backwards graphing calculator. Normally, you enter an equation into your calculator and then get a graph of the curve. The way the IGC works is, you type something you’d like as your curve, like ‘Hello World’ or ‘I love you’. The IGC produces an *equation* which has this phrase as its graph!

Link via Geekologie

I have a soft spot in my heart for geeky wristwatches. Maybe it’s all those childhood conditioning (Dick Tracy’s wrist phone, anyone?) but when Tokyoflash came out with their limited time offer of the Casio Databank 2888JA, I’m all over it. It’s a bit pricey, so for the budget-conscious geek, may I suggest our retro-fun Cal-Q-Tek 2000 wrist watch over at the Neatorama Shop?

Links: Casio Databank 2888JA – Thanks Paul! | Cal-Q-Tek 2000 Calculator Watch