Big Think There are only two events in the universe that defy the laws of physics: black holes and the big bang, and while scientists try to explain them, crucial evidence may be eaten up in the meantime. Christophe Galfard's book is "The Universe in Your Hand A Journey Through Space, Time, and Beyond" ( Read more at BigThink.com: Follow Big Think here:YouTube: Transcript - The interesting thing about trying to unravel the laws of nature is that yes, we have found some laws. We understand gravity to some extent. For a long time gravity has told us that nothing can escape the gravitational grip of a black hole. And everything we had known about black holes until the mid-1970s was only related to gravity.
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Aprender español en internet Speak Languages! A Rooftop Garden is a Fun and Exciting Way to Container Garden. Rooftop Garden Advantages They cool and shade buildings, which reduces the 'heat island' effect of a city. Retains and utilizes rainwater, provides wildlife habitat, and enhances the roof membrane life. Container Gardening The first option for rooftop gardening is container gardening . In rooftop container gardening, few to no modifications are made to the existing roof structure; containers – anything from plastic swimming pools to recycled-wood planters – are placed on a rooftop and filled with the desired soil type and plants. One problem you might face here, is the soil in rooftop containers might thaw on a warm winter day. Also with a rooftop garden, the container material must be carefully considered in places with extreme climates. Green Roofs A great option to explore as an addition to "green houses", is a green roof. This is the second type of a rooftop garden. History Lesson: By the year 1996, 10 million square meters of roofs in Germany had been covered with gardens.
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