Cross-border water management - The Sixaola River runs along the border between Costa Rica and Panama. For many people, it forms a crucial part of their livelihood, but climate change has caused extreme fluctuations in the water level. In the rainy season masses of water flow down from the mountains, causing the river to burst its banks. That causes damage to nearby farms, and sometimes even changes national borders. After heavy flooding, a farm that was once in Costa Rica had suddenly 'moved' to Panama, with far-reaching consequences for local people. India's Changing Taste In Food - 500 million of India's 1.3 billion people are vegetarians, often for religious reasons. They don't eat meat - so that animals won't have to suffer to feed them. But eating habits are changing in India. More and more people, especially in the growing middle class, are eating meat. Meat consumption in India has more than doubled in the last decade. Young people, in particular, are flocking to the franchises of Western fast-food chains that are mushrooming in every city. Global Brains: GravityLight - Often the simple ideas are the best. That's especially true for people who can't afford the most up-to-date technology. With that in mind, Martin Riddiford and Jim Reeves invented the GravityLight. The London-based duo had the idea of creating light from gravity. Their lamp functions just by hanging a weight on it. All you need to do to get the lamp to work is lift the weight every 30 minutes. Trouble downstream: Ethiopia, Egypt and the Blue Nile - Egypt is casting worried looks towards the south. Ethiopia is currently building the biggest dam in Africa on the Blue Nile River, close to the border with Sudan. The plan is to use the river's vast masses of water to create energy. That could cause water shortages further up the river in Egypt, but Ethiopia says it needs to use its resources to help economic growth and attract foreign investors. Global Living Rooms: New Zealand - Today, we're visiting Joy and George -- from Baylys Beach, New Zealand. They really enjoy visits with their grandchildren. Sometimes, the kids come over to ride motorcycles -- or they all pile into an open-bed truck and head for the beach.