The following is a list of the various contract types that are issued, reviewed, and negotiated by Office of Research*, with brief descriptions of the most common contract vehicles we process. Amendment / Modification. A contractual award document that modifies any aspect of an existing award.
All users who have the torrent open make up what is called a swarm. Technically, a seeder is someone who has 100-percent of the pieces that make up the torrent. Initially, the first few leachers within a swarm feed off the seeder.The more seeders the faster the download will go.    Leechers are people who has a negative effect on  the swarm of the torrent. Leechers are commonly the users who  download much than they upload.
A bulldozer is a crawler (continuous tracked tractor) equipped with a substantial metal plate (known as a blade) used to push large quantities of soil, sand, rubble, or other such material during construction or conversion work and typically equipped at the rear with a claw-like device (known as a ripper) to loosen densely compacted materials.