If you are enabled for margin trading, you can easily get a margin balance by simply buying more shares than you have money deposited for, or withdrawing money from the account in amounts higher than your cash balance. Ameritrade just acts like you have the money in both circumstances and allows the transaction.
4. Mosquitoes vary in their size: they reach 1.6-12.5 mm (0.5 inch). Fossil mosquitoes were even 5 cm (2 inch) long. 5. Mosquitoes do not bite, they suck. 1,200,000 mosquitoes would be necessary to completely drain the average human of blood. Well, unless you die before, but of irritation. 6. An experiment in the Canadian tundra found that people who bared arms, legs and torsos reported approximately 9,000 bites per minute from swarming, newly hatched mosquitoes.
The male mosquitoes sometimes have to wait for about a day for their reproductive parts to fully develop. They locate females by listening for the sounds of their wings, which run about 250-500 beats per minute. The mosquitoes join, and the males pass sperm to the females, perpetuating the mosquito life cycle. Once their job is done, male mosquitoes live three to five days. The females tend to mate only once, but live considerably longer, depending on how much warmth and moisture is in their environment.