ideas

It is not possible to live in cleanliness 
Having property taxes fund public schools is wrong 
It is not reasonable to expect the best healthcare that money can buy, unless you are willing to pay for it. 
Don't borrow money to buy things that you do not need. 
Long term prison sentences don't make any sense. A sentence of up to a few years is a practical punishment. A life sentence for someone who cannot remain in society makes sense. What is a 30 year sentence supposed to do? 
We should spend as much resources as neccesary to assure that all children are as well educated as is practical. 

Biology

The function of a diploid genome is poorly understood. Intereactions between spefici allele combinations must be prominant, but this generally unappreciated.

Energy

Reusing and repairing things is fundamentally better than making new ones, even if it requires more immediate resource to rebuild or repair.
At 1 kw / square meter solar energy, 10% efficency, 8 hours per day of sunlight, each year a 1 square meter photovoltaic panel will produce the same amount of electric energy as the heat energy content of seven gallons of gasoline.
1 gallon of gasoline contains 41 kw hours of heat energy
1 horsepower is 746 watts
Wireless transmission of eletric energy would be a huge invention
Hydrogen is not an energy source
There are 100 million men in the USA that flush when they urinate. If they pissed in the sink and ran 1 pint of water down the sink instead of using 1 gallon of water in a flush toilet, 1 urinations a day, 365 days a year, it would save 32 billion gallons of water and sewage.
Nuclear power is not sustainable because the problem of radioactive waste has not been solved.