the use of the construction of the envelope depository of U.S. Pat. No. 3,836,980. It uses a double belt conveyor for moving a deposit-containing envelope from an entry slot in the face of a remote banking unit to discharge the envelope into a vaultlike compartment of the banking unit. The compartment is accessible through a vault or safe door to remove deposit envelopes which accumulate in the compartment. The device has sliding gate plates for the entry and exit ends of the double belt conveyor, one of which is opened when the other is closed and vice versa to prevent access from the banking unit entry slot along the conveyor to the compartment at all times.
Special precautions must be taken and multiple bank personnel must be provided toeven be involved in cognitive disorders, though these remain open and largely untested questions.

"It's not clear how critical this phenomenon is to biology," cautioned Krotov. He characterized the present state of research as one in which scientists, flush with results from early rounds of experiments, can now refine and update their models of criticality, and use those to inform new investigations.

One important insight, said Krotov, is that criticality in biology won't precisely resemble what's seen in the classical, physical systems where criticality was first studied. In the latter — the aforementioned pile of sand, or magnets losing their magnetization at high temperatures — criticality is a global property, the same at every point in a system. Biology could involve many critical networks, nestled together in hierarchies that generate