It’s important to keep indoor humidity at an optimum level (45 to 65 percent). Dry air in the winter is one the main causes of sinus infections and sore throats. You can use a mechanical humidifier to add moisture to the air, but these devices require constant cleaning to prevent the growth of microorganisms.
An easier way to add humidity to a room, is to put a few areca palms in it. These palms release copious amounts of water into the air, and remove chemical toxins too. They are consistently rated among the best houseplants for removing all indoor toxins tested. According to B. C. Wolverton, author of How To Grow Fresh Air, a six foot (1.8 m) areca palm transpires approximately 1 quart (1 litre) of water every 24 hours. So if you put three in your bedroom, the palms will be release three quarts of water per day — not bad!
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The most efficient treatment for burns is: 
This plant, the Club Moss (Selaginella Lepidophylla), has been around for 290 million years. It pre-dates the dinosaurs, and survived through their destruction, it also made it through the ice age and continues to thrive to this day in the 21st century. It can dry up and hibernate for as long as 50 years at a time. During this time it will curl up and travel around with the wind like a tumbleweed in search of water.
The 
It’s great to brighten up a cold winter day by growing plants under lights indoors. This device aims to make indoor growing easier. It has a grow light (a full-spectrum 9-watt fluorescent), and the lamp turns on and off every day, simulating the changing length of days with the passing seasons. The 
This curious planter takes the toil out of tomatoes by elevating the planting bed so vines grow downward. The hanging vines need almost no attention as tomatoes ripen in the air (not on the ground) where they won’t rot.
From Japan comes this small but efficient plant. It’s a bonsai for an indoor garden on a desktop or a windowsill. The tree can be repotted in a larger pot or outdoors for growing larger. They are $12 each from 
Author B.C. Wolverton originally began his research to investigate creating a breathable environment for a NASA lunar habitat. What came of that research was the discovery that houseplants are the most efficient filters of common pollutants such as ammonia, formaldehyde and benzene. (See our list of the 
These ceramic “Egglings” look and feel like real eggs. But if you crack one open, and add water, you’ll soon have plant growing. Each Eggling comes with a terra cotta tray and seed pack. The plants will grow for months in their shell and can be replanted in soil.
These gift trees, from the 
