Answer to Question 1
Section 2703 of ECPA provides investigators with five mechanisms for compelling an Internet Service Provider to disclose information that might be useful in an investigation of a hacker. A search warrant is preferable to a simple subpoena. Subpoenas aren't good enough for obtaining unopened emails as listed in paragraph number two. Further, under paragraph five, the ECPA does not require notification to the subscriber when using a search warrant. While both procedures can request non disclosure, or at least a delay of disclosure to the defendant, a search warrant has more power.
Answer to Question 2
There are websites that can be used to send traceable emails. This works kind of like sending a registered letter via the postal service in that the sender will receive confirmation that the message was received. One example of such a service is confirm.to. For a modest fee, this website attaches a line of code to your email and then sends it on to the intended recipient. As soon as that person clicks on your email message, a message is automatically sent by confirm.to telling you the IP address, date, and time the email was opened.
Information flows from the nucleus to the cytoplasm and back.
Four types of cellular responses to positional information in animals.
Method of Loci
A summary of the major processes in information restructuring of DNA
Derivative using delta method
Concrete Pathway (Modified Offset Method)