Tapioca

Manihot esculenta, with common names cassava (/kəˈsɑːvə/), Brazilian arrowroot, ... Like other roots and tubers, both bitter and sweet varieties of cassava ...

It must be properly prepared before consumption. Improper preparation of cassava can leave enough residual cyanide to cause acute cyanide intoxication and goiters, and may even cause ataxia or partial paralysis.^[8]  wiki 

 I am keen in zero waste, and my first encounter with using a plant based raw material was the potato plates and cutlery. My friend Ngarimu brought them in one of the Waitangi day festivals.

I am also interested in the tapioca plant where I heard could killed if planted upside down, for my research for my pending book. So glad that recently I made the friendship of James Chew and Lim Kok Keong who have scientific knowledge to debunk the myth of this upside down tapioca.

There is no scientific evidence about the up side down tapioca tree causing death. I wrote a chapter of the book on it.