The best stock market simulation web apps to learn and practise reading technical chart.http://chartgame.com . 

Mac show hidden folder

Go to the terminal. Type the following command

 defaults write com.apple.finder AppleShowAllFiles YES

Then press Option/Alt key and right click on the finder and cick relaunch to see all hidden folder.

to disable.

 defaults write com.apple.finder AppleShowAllFiles NO