By calculation (generator: ["now@trueknowledge.com"]) I know that:

The current time is July 23rd 2014, 22:12:01

By calculation (generator: ["second_parameter@trueknowledge.com"]) I know that:

acre
is the second parameter of
10 acres

I know from locally stored knowledge that:

Fact 1:
4,840
is the multiplier that converts
acre and square yard
([fact: ["127571752@trueknowledge.com"]])

Fact 1
is true for
all time
([fact: ["1050410834@trueknowledge.com"]])

By calculation (generator: ["timeperiodtopoint@trueknowledge.com"]) I know that:

Fact 1
is true at
July 23rd 2014, 22:12:01

By calculation (generator: ["first_parameter@trueknowledge.com"]) I know that:

10
is the first parameter of
10 acres

By calculation (generator: ["product@trueknowledge.com"]) I know that:

48,400
is the product of
4,840 and 10

By calculation (generator: ["class_parametered_object@trueknowledge.com"]) I know that:

area
is the class of the parametered object
10 acres

By calculation (generator: ["parametered_object_corresponding_to@trueknowledge.com"]) I know that:

48,400 square yards
is the parametered object corresponding to
area and 48,400 and square yard

By calculation (generator: ["equivalent_to6@trueknowledge.com"]) I know that:

Fact 2:
48,400 square yards
is equivalent to
10 acres

Fact 2
is true at
July 23rd 2014, 22:12:01

Fact 2:
square yard
is the unit used in
48,400 square yards