Egypt's former President Hosni Mubarak, who ruled the country for 30 years, has been put on trial in the capital Cairo.
He's accused of ordering the killing of protesters during Egypt's huge demonstrations earlier this year.
Those protests eventually led to him resigning.
83-year-old Mubarak has been ill since then and is now lying on a stretcher in a cage in the courtroom while the trial goes on.
The former president is also accused of corruption and his two sons, as well as some other government officials, are on trial too.
Mubarak has pleaded not guilty to all the charges, saying he did not do any of the things he's accused of doing.
Lots of people are unhappy with Mubarak and are watching the trial on huge TV screens. But there are also Egyptians who like Mubarak and are supporting him outside the courtroom.