Heart my brother

I received mail from my brother today with a piece of paper that said:

"Assuming that each SRAM cell in our 256x256 memory array loads Vcell with 2fF of capacitance to ground, how much power would be consumed by toggling Vcell between 1.8V and 1.6V at 1 GHz (in other words, Vcell is at 1.8V for 500ps, and at 1.6V for 500ps)?"

Ummm yeah... thank you? Last time I checked I wasn't an engineer.

Inside the folded piece of paper was the following note along with a $45 check:

The memo says, "Stop losing your bus pass!"

Heart you, brother! Thank you for brightening my day and the generous gift!