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.
Only female mosquitoes bite and feed on humans. They need a blood meal in order to lay fertile eggs. Most species of mosquitoes breed continuously, so a female will search for a blood meal approximately every two days in order to lay another batch of eggs. However, both male and female mosquitoes feed on nectar from flowers as their main source of energy.