Thanks to the minimum wage and tax credits for poor working families, the forces relentlessly pushing up income inequality under Margaret Thatcher have been blunted.These things are measurable; less easy to prove, but just as valuable, are the ways in which Mr Blair has helped make Britain a more tolerant, more cosmopolitan place.
As this newspaper has pointed out before, if America did more to help poor parents with young children, it would yield huge returns.The second problem, less easy to prove, occurs at the other end of the income scale, and may even apply to otherwise rational Economist readers: well-educated, rich parents try to do too much (see article).
Some go so far as to say that we are now less religious and more secular than in earlier times, which is easy to say yet less easy to prove: both terms -- the "religious" and the "secular" -- yield to interpretations that support whatever argument one chooses to make.
While the stringency of the pluripotency tests available for mouse, reaching to the birth of mice from tetraploid complementation experiments [18], [19], [20] seems convincing, pluripotency of human cells is far less easy to prove.
As we show in Figure 8, there is no doubt that the procedure can induce ectopic insulin-positive cells, but it is less easy to prove that they are indeed beta cells with the full range of properties expected of this cell type.
