sam schmidt wants to use test blocks like this to demonstrate its strength. the concrete is put under pressure until it breaks and it manages to withstand the same load as normal concrete. this pavilion at lake os university and nigeria is made of cassava concrete, a solid, new eco friendly alternative in construction. if i'm a blood is red, why i? and now over to you, what have you always wanted to know? if you had a question about science nature, technology all makes and then just ask if we answer it on the show, we'll send you a little surprise as a thank you rides or send a video message to tomorrow to day at d. w dot come. this week's question comes from will the false nixon in nigeria? oh, how long can a person survive without eating fasting or freely choosing to go without food is a common custom around the world. people up to fax for a certain time for religious health or political reasons. but how long a person can survive without eating depends on many factors. the amount of fact reserves they have, their age and general health, all play an importan

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