The appeal over the 19-year-old poisoning case gets more than 100,000 signatures.
Graduates with a parent in officialdom earn on average 15 percent more than their peers in their first job.
Repressive policies hamper prevention goals, a leading doctor says.
Work on the May edition is delayed after last month's cover story draws official ire.
The herders say they are victims of China's exploitation of resources.
The demonstration falls on the sensitive May 4th Movement anniversary.
Standards for testing 'natural' bottled spring water date back to the 1950s.
Local authorities are still powerful enough to order psychiatric treatment.
Tan Zuoren was jailed for representing victims and opposition to a chemical plant, campaigners say.