To Dave and all fathers or mothers: I found this blog to be wonderfully exciting, watching a seven year old brain absorb technical material as Sagan does. As a father of two sons who retired from Texas Instruments here in Dallas, I can directly relate to this. Sagan is so fortunate to have a parent who can devote his knowledge and energy to his development. I raised two sons, however my working hours at TI in the Linear Products division were working 12 hour days and that hindered my ability to be able to focus on both sons. My boys however saw me working on equipment in electronics at home, and they learned much in observation such as soldering, troubleshooting to a faulty component, etc. One son went on to receive multiple degrees in Virus migration and now works for a well known big pharma company. The other son went into the Navy and now works in building maintenance of an 80 unit apartment unit repairing A/C, wiring, plumbing, etc. The older son "the brain with the degrees" recently repaired his flat screen TV by replacing bad capacitors in the power supply. YouTube works wonders in teaching. Both sons have successful careers. The point of all this is that Sagan may go on to work in electronics later in life, or possibly not. But the knowledge he receives early in life with Dad will certainly add greatly to whatever his choices may become....Great work there Dad!!!