Sciatica is nerve pain from irritation of the sciatic nerve. The sciatic nerve is the largest nerve in the body. The sciatic nerve begins from nerve roots in the spinal cord in the low back and extends through the buttock area to send nerve endings down the lower limb.
Aircrack-ng is a network software suite consisting of a detector, packet sniffer, WEP and WPA/WPA2-PSK cracker and analysis tool for 802.11 wireless LANs. It works with any wireless network interface controller whose driver supports raw monitoring mode and can sniff 802.11a, 802.11b and 802.11g traffic.
A nasogastric (NG) tube is  a flexible tube of rubber or plastic that is passed through the nose, down through the esophagus, and into the stomach. It can be used to either remove substances from, or add them to, the stomach. An NG tube is only meant to be used on a temporary basis and is not for long-term use. NG tubes after surgery for inflammatory bowel disease (IBD) used to be very common and was done as a matter of course. It's now thought that an NG tube is not always needed for every type of surgery or for every patient.