In case you left your gear at home, here’s a collection of virtual school supplies to get you through your lessons – printable graph paper, paper rulers, alarm clock, stopwatch, unit converter, periodic table, speed reader, world stats, stop watch, etc.

Graph PaperIn a pinch you can simply download a sheet of graph paper in pdf format and then print it off. In fact this website offers graph paper in 26 different formats and configurations including logarithmic and semi-logarithmic grids.

http://www.mathematicshelpcentral.com/graph_paper.htm

Paper Rulers

A sheet of paper can work as a straight edge, all it needs are the measurement markings. This website offers more than 20 different rulers for download and print in pdf format, from yardsticks to millimeter rulers to alternating colour squares.

http://www.vendian.org/mncharity/dir3/paper_rulers/

Alarm Clock

In a pinch you can leave your laptop running all night and log in to this website to set a wake-up alarm. The alarm is an odd, escalating sound that requires you to click on it to turn it off. http://onlineclock.net/

Metronome

From Largo to Prestissimo, this online metronome will take your through a large number of tempos at the click of your mouse. It also includes a standard “A” 440Hz tuning note.

http://www.metronomeonline.com/

Speed Readers

For anyone who needs to quickly get through a lot of material in a short amount of time, these online speed reading tools let you copy and paste a quantity of text into your browser and then have it fed to you as a series of flashing words for quick processing. There’s Spreeder and Zap Reader

http://www.spreeder.com/

http://www.zapreader.com/reader/index.php

Interactive Periodic Table

Click on each element to bring up a detailed listing of its properties plus a graph of it's atomic mass and a graph of it's electron orbital configuration. Each element box also includes a link to that element's Wikipedia entry.

http://www.touchspin.com/chem/DisplayTable.html

Here's also a photographic peridodic table

http://theodoregray.com/PeriodicTable/Posters/

Currency, Unit, and Temperature Conversion

From the Institute of Chemistry, this single page has it all with tables you can use to convert all of the major units, plus a few minor ones too. http://www.chemie.fu-berlin.de/chemistry/general/units_en.html

Worldometers Need a global statistic? This online site keeps a real-time, up-to-the-second running tally on a range of global statistics including population, births, deaths, food production, topsoil production, distance the earth has traveled, etc. http://www.worldometers.info/

StopwatchA simple stop/start online stopwatch that keeps track to 0.001 seconds.

http://arantius.com/tools/stopwatch