One meaning of the term "bracketing" is "to place within." This concept of "placing within" is a helpful strategy that students and adults can use to identify and appropriately deal with distracting thoughts.

In stage one, students decide whether their current thoughts are appropriate for the task at hand. If they are not, students can bracket them in stage two.

It is very helpful to teach students (and adults) to classify thoughts into three groups:

Now: appropriate to follow up on now, i.e. thoughts that promote full engagement in the lesson or other current task. During reading, for example, a "now" thought would be about the content of the reading (reading comprehension) or about ways to stay focused on reading.

A "now" thought about comprehension of a history text assignment could be, "There are three branches of the state government, and the governor is the head of the executive branch of the government." A "now" thought about the process of reading could be something such as, "I didn't understand what I just read…I need to read that again."

Later: appropriate to pursue, but not now, for example, an interesting related idea, a clarifying question or an important task to perform. A "later" thought might be, "I wonder what laws our governor is in favor of? I could look that up on the internet." Another example is, "I forgot to talk to my English teacher. I have to do that after school."

One of the most powerful substances on the planet is sulphuric acid. It is an extremely strong and hazardous acid known in chemistry with a formula H2SO4. It is characterized as a colorless, transparent, and odorless liquid that is viscous and very corrosive. Among all the industrial chemicals, this acid is the most largely produced. That is why it is said to be an indicator of a country's level of industrialization.

Agriculture claims majority of the industrial production through agricultural fertilizers uses up to 65% of the manufactured acid. However, the chemical is also present in the manufacture of dye, alcohol, rubber, plastic, ether, adhesive, film, medicine, paint, wood preservative, pharmaceutical products, paper, pulp, petroleum products, and explosives. The list could go on. But it can occur more frequently in car batteries, in which the lead-acid compartment contains the strong acid of sulphur.

This substance was first prepared by Johann Van Helmont through a process known in chemistry as destructive distillation of iron (II) sulphate.

Today production of the acid can be through lead chamber process and contact process. The acid produced can be available in varying concentrations and qualities depending on the demands of the buyers. In the first process, hot sulphur dioxide enters the bottom of the Glover tower, a reactor, wherein the acidic gas is washed with nitrous vitriol and then mixed with oxides of nitrogen. In the process, some of the sulphur dioxide becomes oxidized to form sulphur trioxide, which upon dissolution into the substance wash yields Glover acid that is roughly seventy-eight percent H2SO4.