Lifehacker many tips this week teach you how to stay cool, get your car fixed and curse like an unemployed pharmacist.

Make your own sun jar
Here's their review on Gmail's Todo list
Check your air conditioner now to save yourself trouble later

Combine Google and Wolfram results
Build a DIY portable Air Conditioner
Use OpenDNS to filter your content

Test your mechanic with tiny jobs before big ones
Google Gears gets updated for Firefox 3.5
Learn the hidden benefits of your credit cards

Sleep like an Egyptian
Where to hide cash in your house
Drop F-bombs, C-bombs, and S-bombs to relieve pain

Use a damp towel to cool down your house
Take better sunset photographs
Diagnose and fix a running toilet