Trophic cascades are powerful indirect interactions that can control entire ecosystems.

In the early 1900s, when wolves roamed Yellowstone, young trees such as aspen and willow were abundant. In 30 years, after wolves were hunted out, the forest stopped regenerating. Reintroducing wolves into Yellowstone National Park after nearly 70 years of absence has been controversial. However, the effects have been utterly transformative to the Yellowstone ecosystem.

A trophic cascade recently has been reported among wolves, elk, and aspen on the northern winter range of Yellowstone National Park, Wyoming, USA.

What is a trophic cascade and how exactly do wolves change rivers?  What happens when a species that has been hunted to extinction is introduced to its happy hunting grounds after 70 years? Find out in this beautiful little film. 

The Future for Pregnancy and Child Birth - future reproductive technology

Since the early 1990s reproductive technology has been used to help women get pregnant. However, future technology may make it so that they don't actually have to be pregnant. There is a strong possibility that one day in the very near future babies will be conceived and grow in artificial wombs that are hooked up to a placenta machine. 

Scientists have been working on creating human sperm cells from embryonic tissue, as well as manufacturing eggs and even entire embryos. In 2001, researchers from Cornell University began growing sheets of endometrial tissue; when the sheets proved too thin to accommodate embryos, they were able to construct a freestanding uterus.

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AirDrop: Turning Air Into Water

This simple, but brilliant, design actually pulls water from air through condensation. This solar- powered AirDrop low-tech device, takes  in air from above the soil and cools it  below ground, causing the water in the air to condense, in a passive  system of sub-surface drip irrigation.

With this AirDrop device, the water is delivered directly to the plants' roots, where it's most needed and the water has much less opportunity to be wasted, due to evaporation.

The 28-year old Australian inventor, Edward Linacre took his biomimicry cues from Australia's hardy desert rhubarb and from the Namib beetle, which have evolved to collect water from the air.

It works by using a solar powered fan to drive the hot air underground through a network of piping that rapidly cools the air and condenses the water out it. This is the most ingenious and efficient form of irrigation, since it does not rely on the bodies of water for its sources. Currently, it's in the prototype phase. 

While still in the beginning stages and not available for purchase... yet, this is an idea and a project to watch closely. Very closely. More detail

Revolutionary "bionic exoskeleton"

Could you ever imagine that soon wheelchairs might become irrelevant? Wearable robotic suits that allow people with lower-body paralysis to walk upright again. Well, you don't have to imagine it, since the revolutionary "bionic exoskeleton" is now making this a reality. Robotic or mechanical exoskeletons provide the possibility of offering disabled people the kind of protection, support and strength they afford in nature.

Rehabilitation clinics soon will have a variety of exoskeleton machines available to aid patients that have experienced spinal cord injury, stroke, and other neurological disorders. Check out  the different types of exoskeleton machines