A、Workers who listened to the laughter saved effort for the task. B、Workers who watched the funny short film made fewer mistakes

Wasting time on the Internet might actually be beneficial to the work environment, according to a study. Scientists at the University of Harvard divided a selection of workers into two groups. (33) Both were instructed to watch a video of people passing a ball back and forth. Each group was then asked if they could remember how many times the ball had been passed. One group was allowed to watch a funny short film online beforehand, and members of the other team had to go straight to work while listening to the laughter of their colleagues in the other room. (34) The research found workers who had watched the funny short film made fewer mistakes when asked to focus on the task than the group that wasn’t allowed to save effort for a few minutes. The study isn’t crucial and critics suggest that the first group may have been disturbed by the laughter of their colleagues. (35) The research concluded that if you forbid workers from using the Internet freely then eventually they become less focused and effective. Some studies have suggested that companies could increase productivity by giving employees " Internet breaks", during which they’re free to do whatever they like. It’s not too odd an idea that Google employees have long enjoyed "20 percent time" where they are allowed to do as they please for a fifth of the working day.
33. What were the workers asked to do in the research?
34. What was the result of the research?
35. What can be concluded from the research?