You cannot determine the sender's address, let alone his name, by 'decoding ' the email headers. All they will give you are the hops as the email is transferred. This is why Gmail is preferred by scammers, because the headers only resolve to the Gmail router in the USA and no further.
When Amy answers the text from Dave on her phone she is actually holding the phone upside down.
Leonard and Sheldon never acknowledge or refer to the fact that they would need to answer for spending a large amount of grant money without being able to account for it.