And much, much more there are deep, worthy challenges everywhere you look (and I hope to be posting about some of them soon).
Hovering over Annapolis are deep anxieties over the challenge from a resurgent Shiite and non-Arab Iran, with its nuclear program and its successful allies and proxies in southern Lebanon, Iraq and the Palestinian territories.
"I think it's healthy to gain a perspective on who you are deep down, question yourself and challenge yourself; it's important to do that". .
The problem of isospectrality in the theory of linear operators is deep and challenging.
Many challenges are deep-set and structural in nature, but whatever their form, recognising their character helps in addressing them.
There are clearly deep challenges and opportunities for the theory of PCET as it applies to biology.
This disagreement can be deep and quite challenging.
Many economists, scholars and politicians believe that China is facing deep challenges to its economic model, that it needs to shift from a fixed investment-fueled economy, where the hand of the state is heavy, to one with more private enterprise and market forces.
"The landscape is complicated, but there's deep grassroots support to challenge inequality and improve job conditions," Sonn says.
