Some hearing milestones your child should reach in the first year of life: 1  Most newborn infants startle or jump to sudden loud noises. 2  By 3 months, a baby usually recognizes a parent's voice. 3  By 6 months, a baby can usually turn his or her eyes or head toward a sound.
(December 2008). Direct digital control (DDC) is the automated control of a condition or process by a digital device (computer). DDC is considered by many to be a more modern, granular and responsive update to older HVAC control systems based upon PLC technologies.
Actually David5300 DDT is a vector control agent, not a cure for malaria, and it is still used in the same quantities as it was decades ago (via black market and some WHO approved uses). It is quite harmful to the environment which is why it was supposed to be stopped.