Identify the sentence that does not fit with the others:
A. Curiosity drives scientific discovery by inspiring new lines of inquiry.
B. Funding for major scientific projects is usually provided by governments.
C. Breakthroughs often come from questioning established assumptions.
D. Many transformative ideas emerge from bold experimentation.
Question:
Which sentence is the odd one out?
Sentences A, C, and D all describe intellectual or methodological drivers of scientific progress (curiosity, questioning assumptions, and bold experimentation).
Sentence B, however, shifts focus to the financial or institutional support for science, which is a different theme. \[ \boxed{\text{The odd one out is B.}} \]
For any natural number $k$, let $a_k = 3^k$. The smallest natural number $m$ for which \[ (a_1)^1 \times (a_2)^2 \times \dots \times (a_{20})^{20} \;<\; a_{21} \times a_{22} \times \dots \times a_{20+m} \] is: