If you're using Chrome or Firefox, a useful plugin to have on hand is InfoSextant:

https://chrome.google.com/webstore/detail/infosextant/plieanmckkckfcdfaobonmmmbeniaige?hl=en
https://addons.mozilla.org/en-US/firefox/addon/infosextant/

It automatically redirects Wikipedia links to Infogalactic.