| The activation energy of the reaction is the amount of energy it takes for the reaction to get started. |
| She started the meeting with a brief review of the previous meeting. |
| Angry fans called him a sellout when he started appearing in television commercials. |
| If you'd like to get started with cuneiform writing, this tool from the Penn Museum is handy. |
| Someone had rigged a booby trap that blew up the car when the engine was started. |
| As soon as they learned of his arrest, the media vultures started circling. |
