LONDON (AP) — Cambridge University says physicist Stephen Hawking is still hospitalized but recovering from a chest infection.The university said Wednesday that Hawking is "on the road to recovery" from the illness that has kept him at Addenbrooke's Hospital in Cambridge since earlier this week.The 67-year-old scientist is well-known for his work on black holes and his best-selling 1988 book "A Brief History of Time."Hawking has remained active although he was diagnosed at age 21 with ALS (amyotrophic lateral sclerosis), an incurable degenerative disorder also known as Lou Gehrig's disease.He has been almost completely paralyzed for years and communicates through an electronic voice synthesizer activated by his fingers.
Stephen Hawking. Scientist Stephen Hawking, 67, has been taken to a hospital in an ambulance after falling very ill, reports .

According to a physicist at  in the United Kingdom, "Professor Hawking is very ill" and had been rushed to  in  to undergo tests.

His condition is not yet known, but according to the University, Hawking has been ill with a chest infection for a few weeks. On April 6, he cancelled an appearance at  due to his illness. Hawking also suffers from severe .

"He Hawking is undergoing tests. He has been unwell for a couple of weeks," said the university in a statement. In a later statement, the University stated that Hawking was resting comfortably "but will be kept in hospital overnight" for observation.

 head Peter Haynes offered his sympathy saying, "Professor Hawking is a remarkable colleague. We all hope he will be amongst us again soon." Hawking has worked in the same department as Haynes for over 30 years.