In the Internet Age anything is possible to fake. Here are some tips to verify what you find out on the web.
Be aware of bias--Is the website trying to sell you something?
Look for science oriented sites--.edu, .gov are usually trustworthy, is it a professional organization or someone's hobby?
Does the article include the sources of its information (references)
Look for peer reviewed articles (articles reviewed by other experts, easy to find on Google Scholar)
Beware of single studies--look for replication/repeatability
Respect others opinions (agree to disagree)
1. Photo or painting?
This, alleged, photograph is from Namibia and was used in a National Geographic edition. Many claimed it is actually a painting. Verify the truth. Find 3 reputable sources.
2. Relight a candle?
Find three reputable sources to prove or disprove this video.
3. Hobo Spiders dangerous?
Find two reputable sources that show the danger or not of Hobo Spiders to humans. Find two not reputable sources.