Ten days before schools reopen for the summer term in eastern Zimbabwe, Hellen Tibu is worried about how she will pay the fees for her sister's education. The 22-year-old landmine-disposal expert smooths the creases from her younger sister's uniform as it hangs on the washing line outside a relative's rooms in Sakubva, a densely populated township in Mutare. The shirt is faded around the collar and a new one is needed.