Look it up by name via mediabiasfactcheck.com. Simply enter the website or media outlet and this site returns information on typical content, as well as a Left to Right bias rating scale. Additionally, you can also view Questionable Sources, including fake news, hate sites, or those rated as Least Biased.
The example above represents the rating for the website buzzfeed. Read the review.
Validating Information in Websites or Emails via
The best mythbuster out there is a website called snopes.com. Simply type your 'urban myth' into snopes and it will likely tell you whether the legend / rumor is true, false or somewhere in between.
Here is what Snopes has to say about exploding pyrex.
The response also provides the email in its entirety, the origins of the rumor and any sources used to determine the validity of the claim.
This site is not limited to email hoaxes. It also has a lot of information that shed light on confusing political sound bites and many other topics as well.