How big is a trillion?

From a trusted colleague who confirmed it on his scientific calculator:

There is a lot of talk about trillions of dollars these days. I heard this last week and verified it with my trusty HP calculator.

A million seconds ago was last week (11 days ago).

A billion seconds ago, Nixon was running for re-election in April of 1971.

A trillion seconds ago was 30,000 years before the birth of Christ.

Wow, a Trillion is really big!