By Natasha Baker TORONTO (Reuters) – Too many things to do and not enough time to do them? New apps are designed to act as personal time assistants to get tasks done and improve productivity. Timeful, a free iPhone app available in the United States and Canada, uses artificial intelligence to schedule tasks in users’ calendars based on meetings and events they are already committed to. “Time is by far the most precious resource we have and by far the one we manage the poorest,” said Dan Ariely, co-founder of the California-based company Timeful. “There’s a cacophony of things that say ‘do me.’ We provide algorithmic help to make them more concrete, because if it’s not in your schedule, it’s unlikely to get done,” said Yoav Shoham, a co-founder of Timeful.