• the environment
• environmental problems
• seeds & plans
• animals
• food & drink
• stages of life
• health
• healthy eating
• eating habits

• Age is an issue of mind over matter. If you don't mind, it doesn't matter - Mark Twain

• Anyone who stops learning is old, whether at twenty or eighty. Anyone who keeps learning stays young. The greatest thing in life is to keep your mind young - Henry Ford

• Wrinkles should merely indicate where smiles have been - Mark Twain

• Age appears to be best in four things; old wood best to burn, old wine to drink, old friends to trust, and old authors to read - Francis Bacon

• famous people
• war&peace
• control&power
• news&mysteries of history
• protest
• educational system
• places at school/university
• types of school
• exam&qualifications