A retired scientist lived half of his life in poor rural areas and half in luxurious cities.
(1) Keeping our DNA alive. (2) Be Happy Validly. (3) How to quit INVALID happiness.
(1) Be Happy Validly. (2) Invalid happiness: --- It makes up about 90% of today's happiness. It wastes about 90% of limited resources on the earth. It leads us to self-extinction.
Be Happy Validly.
(1) Be Happy Validly!