1 Merino is one of the softest types of wool available, because of finer fibers and smaller scales.  Merino has an excellent warmth-to-weight ratio compared to other wools, in part because the smaller fibers have microscopic cortices of dead air, trapping body heat similarly to the way a sleeping bag warms its occupant.
Transistorâtransistor logic (TTL) is a class of digital circuits built from bipolar junction transistors (BJT) and resistors.
Each DTMF tone is actually two tones-a low-frequency tone and a high-frequency tone-combined. (Hence the name dual tone multi-frequency.) Looking at the standard phone keypad as a grid, the low tone corresponds to the row, while the high tone corresponds to the column.