Major tax-prep providers like Intuit’s TurboTax and H&R Block say they can do “simple” federal income-tax returns for free.

They’re particularly interested in how the Indians’ health changes as they move away from ... The Hadza and Kung bushmen of Africa, for example, fail to get meat more than half the time ...

These rates apply to your taxable income. Your taxable income is your income after various deductions, credits, and exemptions have been applied. There are also various tax credits, deductions and ...