Catherine stood outside the DNA lab for quite some time, observing Greg.

She watched the young chemist perform his usual tasks with seemingly little thought or effort. His lab, usually blaring with loud rock music, was silent, as it had been since the accident.

She was worried about him. His usual vibrancy, and exuberant energy had gone, to be replaced by the weary, miserable appearance he now wore. The enjoyment he seemed to find in his work had vanished, and he usually couldn't wait to leave when his shift had ended. He did his work in silence, and as quickly as possible.

When he talked he seemed like a different person, all usual features of his conversation-joking teasing, laughter- were replaced by an almost bored tone of voice. Catherine felt a pang of guilt.

'He hasn't been the same since the accident.' She thought to herself. But she had a feeling there was more to it than that...