June 2, 2015 9:33 pm
The National Transportation Safety Board is currently investigating what caused the Metro crash yesterday.
The NTSB is the independent agency that handles all large transportation accidents.
Ted Lopatkiewicz is the director of public affairs for NTSB and tells us how his agency conducts investigations.
(Read the full story.)
(See an NTSB plane accident recreation.)
How the US Mint and NIST are perfecting the money-making process.