What can search the internet and select elements based on important words

What type of forensic evidence was recovered during the bomb set off at the new mexico facility on the video that was similar to the evidence obtained at the boston bombings and how did the evidence allow the researchers to connect other pieces of evidence to the same bomb?

Which of the following "invisible" marks represents an inserted tab?

How do i copy and paste equations and pictures like math graphs, to post on this site to get my questions answered?