Re Perfect pitch.
If you want your children to be able to best distinguish between similar sounds (l and r), have perfect pitch, etc. What can you do to encourage this? (ie, will encouraging them to learn another language help, or would playing music, or what?)
I’d like to, if and when I have kids, give them advantages like this, but without pushing them… just expose them to information and let them soak it up if they can/ want to.
Re whistling free calls.
I belive what was whistled was the loud steady 2600hz tone that signalled the end of a call, then a modified dialer was used for the digits which consisted of two tones at once, much the same as standard dialing tones, except a bit higher in pitch. (they sound shrill to me, compared to the regular tones.)
A brief rundown on the (obsolete) phone freaking…
Two switches communicate over a ‘trunk’ line, they play a 2600Hz tone when the line is empty so that they know if the other switch is there. When the tone goes away, the destination switch knows to listen for dialing. What you did was call a distant phone number, then play a 2600hz tone, this fools the two switches (or two of many) into thinking that the phone call they were carrying is gone, so they go into waiting mode, then the tone goes away and they prepare to accept the dialing information for the next call. Because a customer isn’t supposed to get here, and can’t, with the regular phone, command the switches, they don’t do the billing, so once you’re connected, you can dial for free.
But, that’s all obsolete now, unless you happen to live in a third world country. Even if your area uses very old switches for the customer service, likely the long-distance trunks will be newer.
btw, I know I took a lot of liberties with that, it’s just to explain how you can whistle and partly get free calls.