====== SCIENCE OF HISTORY AND EVENTS ======

  * overviews
  * portals
  * lists
  * categories

<a2s>
+----------------------------------------------TIME-LINE------------------------------------------------------+
|                                                                                                             |
|   .----------------. .-------------. .----------------------------------------------.  .--------------.     |
|   |                | |             | |                                              |  |              |     |
|   |      PAST  ----+-+-----+-------+-+----AD---------->  PRESENT   -----------------+--+-->  FUTURE   |     |
|   |                | |     |       | |                                              |  |              |     |
|   |                | |     |       | |                                              |  |              |     |
|   |                | |     |       | |                                              |  |              |     |
|   |                | |     |       | |                                   YEAR       |  |              |     |
|   |    HISTORY     | |   ZERO      | |                                  +-----+-----+--+------->      |     |
|   |                | |    YEAR     | |                             MONTH|     |     |  |              |     |
|   |    ORIGIN      | |     |       | |                            +-----+     |     |  |              |     |
|   |                | |     |       | |                       DAY  |           |     |  |              |     |
|   |                | |     |       | |                     +------+           |     |  |              |     |
|   |                | |     |       | |                HOUR |                  |     |  |              |     |
|   |                | |     |       | |               +-----+                  |     |  |              |     |
|   |                | |     |       | |        MINUTE |                        ↓     |  |              |     |
|   |                | |     |       | |         +-----+                        |     |  |              |     |
|   |                | |     |       | |         |                              |     |  |              |     |
|   |                | |     |       | |  SECOND |                              |     |  |              |     |
|   |                | |     |       | |         |                              |     |  |              |     |
|   |                | |     |       | |         |                              |     |  |              |     |
|   |   BEFORE       | |     |       | |         |                              |     |  |              |     |
|   |    CHRIST   <--+-+-----+-------+-+---------+------------------------------+     |  |              |     |
|   |     (BC)       | |             | |            <------                           |  |              |     |
|   .----------------. .-------------. .----------------------------------------------.  .--------------.     |
|                                                                                                             |
+-------------------------------------------------------------------------------------------------------------+
</a2s>