Can she move fast enough to avoid spit balls?

In my many years in the classroom, I've worked with all kinds of students. I've had students accuse me of having eyes behind my head and being able to read lips. I've seen it all. This latest creation by some Japanese scientists just seems a little ridiculous. According to an article posted in the Telegraph, these scientists think that the robot teacher could teach in areas where there are shortages of human teachers. Here are some excerpts from the Telegraph:

Saya, the female humanoid robot, taught a science and technology lesson to a class of 10-year-old pupils at Kudan Elementary School in Tokyo.

With her neat brown hair, pink lipstick and skirt suit, the robot, created by scientists at Tokyo University of Science, has been designed to resemble as human a form as possible.

Using a range of programmed movements from eyebrow arching to smiling, her face is capable of expressing six basic emotions in the classroom – surprise, fear, disgust, anger, happiness and sadness....

I want to know if the robot teacher can move fast enough to avoid being hit by spit balls. Is it possible that students in Japanese schools don't throw them? Can she grade papers, make phone calls to parents, and help individual students? Can she create lesson plans, administer tests, and grade essays? Obviously, the Japanese scientists that created the robot teacher don't have real classroom experience. In many schools, the robot teacher would not survive an hour.