The cost of keeping porch light 24 hours a day

The average cost of electricity is about $0.13 per kw hours.

Running a typical compact florescent 13 watts (or the brightness of a 60 watts incandescent light bulb)  costs
9.36kw = $1.22/month = $14.60/year


Most of photo sensing doesn't work well with CF, the on-off cause flickers and burning up light bulbs instead.

The alternative solution would be using timer devices,  12 hours on/off  = $7.00/year.

Tall hardy trees - a symbol of longevity

Tall hardy trees - a symbol of longevity take time to grow.  Therefore we are harvesting ancient trees 200-300 years, or thousands year old tree.

Cedar - Great specie of wood for furniture

Yew - It is not a common tree in North America

Olive - This is a surprise to me.

Cypress - Many of the thousands years old can be found in protected national parks

Oaks - slow growing trees, can be found at many local nursery shops